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Review Article |

Prenatal and Perinatal Risk Factors for Autism:  A Review and Integration of Findings FREE

Alexander Kolevzon; Raz Gross, MD; Abraham Reichenberg, MD, MPH
[+] Author Affiliations

Author Affiliations: Department of Psychiatry, Mount Sinai School of Medicine (Drs Kolevzon and Reichenberg), Department of Epidemiology, Mailman School of Public Health, Columbia University (Dr Gross), and Department of Psychiatry, College of Physicians and Surgeons, Columbia University (Dr Gross), New York, NY; Unit of Mental Health Epidemiology, The Gertner Institute of Epidemiology and Health Policy Research, Tel Hashomer, Israel (Dr Gross); and Department of Psychological Medicine, Institute of Psychiatry, King's College, London, England (Dr Reichenberg).


Arch Pediatr Adolesc Med. 2007;161(4):326-333. doi:10.1001/archpedi.161.4.326.
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Objective  To review the evidence for the presence of prenatal and perinatal factors that affect the risk of autism and autism spectrum disorders.

Data Sources  Relevant articles were identified by searching MEDLINE, screening reference lists of original studies, and searching major journals likely to publish epidemiological studies on the topic.

Study Selection  For inclusion in this review, studies required (1) a well-defined sample of cases drawn from population-based registers or cohorts; (2) standardized, prospectively collected obstetric information from birth records or registers; (3) comparison subjects drawn from the general population with information on obstetric complications collected from the same source; and (4) a standardized format for presentation of data, allowing for comparisons among studies.

Main Exposures  Parental characteristics and obstetric complications.

Main Outcome Measures  Rates of autism and autism spectrum disorders.

Results  Seven epidemiological studies were identified that fulfilled inclusion criteria. The parental characteristics associated with an increased risk of autism and autism spectrum disorders included advanced maternal age, advanced paternal age, and maternal place of birth outside Europe or North America. The obstetric conditions that emerged as significant fell into 2 categories: (1) birth weight and duration of gestation and (2) intrapartum hypoxia.

Conclusions  Evidence to suggest that parental age and obstetric conditions are associated with an increased risk of autism and autism spectrum disorders is accumulating. Although not proven as independent risk factors for autism, these variables should be examined in future studies that use large, population-based birth cohorts with precise assessments of exposures and potential confounders.

Autism is a chronic neurodevelopmental disorder characterized by social and language impairments and stereotyped, repetitive patterns of behavior.1 Symptoms manifest by the age of 3 years, and affected individuals often require constant care from family members and professionals. Other disorders that are included in the autism spectrum include atypical autism, Asperger disorder, Rett disorder, childhood disintegrative disorder, and pervasive developmental disorder not otherwise specified. Autism was previously reported to affect approximately 5 of every 10 000 children,2 but prevalence rates of both autism and autism spectrum disorders (ASDs) may have increased markedly in the past decade.3 Two recent population-based studies4,5 conducted by the Centers for Disease Control and Prevention in the United States reported ASD prevalences of 3.4 and 6.7 per 1000 children. Although this increase may be artifactual to some degree, it may also reflect a true increase in the incidence of ASD and implicates an important role of environmental causes.

Most plausible neurodevelopmental theories of autism focus predominantly on genetic factors.6,7 However, studies of monozygotic twins6,8 indicate that less than 70% of twin pairs are concordant for autism and approximately 90% are concordant for a broader spectrum of related cognitive or social abnormalities. This finding suggests the presence of nonheritable, prenatal, and perinatal risk factors for autism,9 a possibility supported by studies that have shown an association between autism and obstetric complications, prenatal or intrapartum use of medications, and parental preconception chemical exposures. 10,11

Parental, perinatal, and obstetric conditions have been associated with several neurological and psychiatric disorders, including Down syndrome,12 dyslexia,13 mental retardation,14 and schizophrenia,15 as well as with developmental difficulties, such as speech and language problems,16,17 internalizing problems, attention problems, social problems,1820 and hyperactivity.21,22 Despite significant research into the potential role of pregnancy and birth complications in the origin of autism, the causal nature of these associations is still disputed.11 This dispute may be due to several current methodological limitations of studies that have examined associations between parental characteristics and obstetric conditions and risk of autism.

First, many early studies2325 that examined perinatal risk factors in autism had small sample sizes and consequently lacked the statistical power to detect meaningful differences. Second, most studies used clinical rather than epidemiological samples, and such designs are especially prone to selection bias and ascertainment bias. Third, different perinatal conditions may have different roles in the cause of autism. However, many studies use aggregated scores of perinatal and obstetric conditions, such as obstetric suboptimality. Aggregation of conditions might increase the likelihood of nondifferential misclassification of exposure and possibly attenuate the estimate of true associations. Finally, some investigators relied on crude prenatal exposure data, such as maternal reporting of events that occurred during pregnancy. Maternal recall is prone to bias, because mothers of children with autism are more likely to recall prenatal and perinatal events than mothers of controls. This differential recall is likely to bias the true measure of association away from the null hypothesis and lead to spurious positive results. Even when misclassification of exposure by the parent is not conditioned on whether or not the child has autism, it may still bias the results and attenuate a true association.

We sought to systematically review the evidence for the presence of prenatal and perinatal factors that affect the risk of autism and ASDs. We have chosen to focus this review on studies that used large, population-based epidemiological samples to explore associations between prenatal and perinatal variables and the risk of autism and ASDs. The focus on such studies has several advantages. First, these studies have sufficient statistical power to detect differences in rates of autism between those exposed to adverse prenatal and perinatal events and those unexposed. Second, when subjects are drawn from clinical samples, as compared with the general population, selection bias and lack of information on potential confounders are more likely to occur and threaten the internal validity of the study. Third, results may be generalized to the underlying population with significantly less constraints. Finally, such studies typically use standardized measures of exposures and valid and reliable ascertainment of outcome (autism), whereas studies of clinical samples usually rely on data collected nonsystematically.

This review summarizes the findings from all of the epidemiological studies published to date. We also endeavor to draw evidence-based conclusions, elucidate further the nature and extent of prenatal and perinatal risk in autism, and suggest directions of future research.

INCLUSION CRITERIA

Studies were included in the review if they fulfilled the following a priori defined set of criteria: (1) inclusion of a well-defined sample of cases drawn from population-based registers or cohorts; (2) use of standardized, prospectively collected obstetric information from birth records or registers; (3) inclusion of comparison subjects drawn from the general population with information on obstetric complications collected from the same source; and (4) use of a standardized format for presentation of data on individual obstetric complications, allowing for comparisons between studies.

SEARCH OF STUDIES

The search strategies used were (1) a computerized MEDLINE search for English-language biomedical articles that examined prenatal and perinatal conditions in autism and ASDs (the following keywords were used: autism, risk, prenatal, perinatal, obstetric, and familial); (2) screening of reference lists of original articles; and (3) a manual search of major journals likely to publish epidemiological studies on the topic, including the New England Journal of Medicine, JAMA, Lancet, BMJ, American Journal of Epidemiology, Epidemiology, Archives of General Psychiatry, American Journal of Psychiatry, and British Journal of Psychiatry.

LITERATURE SEARCH

We identified 7 articles that reported results from epidemiological studies that fulfilled all 4 inclusion criteria. The characteristics of the 7 studies and a summary of their main findings are presented in Table 1 and Table 2. Four of the 7 were population-based cohort studies,2629 and 3 used a case-control study design.3032 Five different geographic locations were represented, including Denmark,26,28,32 California,27 Sweden,30 Western Australia,31 and Israel.29 The 3 studies from Denmark26,28,32 have partially overlapping samples, but since they have slightly different methods and examined diverse and not always overlapping risk factors, we review the results of all 3 studies. The study by Eaton et al26 includes a secondary analysis of a larger cohort, but the authors restricted the analysis to a smaller set of variables than used in the main analysis. All studies included affected cases with either Diagnostic and Statistical Manual of Mental Disorders (DSM)27,31 or International Classification of Diseases (ICD)26,2830,32 diagnoses of autism, although 4 used a combined sample of autism and ASDs.2729,31 Two of these 4 studies analyzed autism and ASDs separately.26,31

Table Graphic Jump LocationTable 1. Prospective Population-Based Cohort Studies Included in the Review of the Association Between Obstetric Complications and Autism or ASDs
Table Graphic Jump LocationTable 2. Population-Based Case-Control Studies Included in the Review of the Association Between Obstetric Complications and Autism or ASDs
SUMMARY OF FINDINGS

Crude estimates and adjusted estimates that take into account the effect of potential confounders are summarized in Tables 1 and 2. In this review, we focus on factors found by at least 2 studies and associated with at least a 50% increase in the risk of autism (ie, a relative risk of 1.5 or higher). Such factors are less likely to be explained by mismeasured or unmeasured confounders. When applying those criteria, 3 parental characteristics and 2 broadly defined obstetric conditions appear to be associated with an elevated risk of autism and ASDs across the 7 studies.

PARENTAL CHARACTERISTICS

The parental characteristics that emerged as significant predictors of autism and ASDs included advanced paternal age, advanced maternal age, and maternal place of birth outside Europe or North America for children born in Denmark and Sweden.

The effect of advanced paternal age was examined in 4 studies. Paternal age remained a significant risk factor for autism and ASDs in 3 of the 4 studies after controlling for confounding variables, including maternal age (range of adjusted relative risk, 1.58-5.75).28,29,32 In a recently published study, Reichenberg et al29 demonstrated a greater than 2-fold increase in the risk of ASDs with each 10-year increase in paternal age.

Advanced maternal age was one of the most frequently studied risk factors for autism and was associated with risk of autism in 6 of the 7 studies before controlling for potential confounders.2629,31,32 Older mothers have an increased risk of obstetric complications possibly due to uterine muscle dysfunction and diminished blood supply with age.33 Maternal age remained an independent risk factor in 3 studies also after adjusting for other variables: the relative risk for mothers 35 years or older was 3.4 in a US cohort,27 2.3 in a Denmark study,26 and 1.5 in an Australian study.31 Only the Australian study, however, took paternal age into account in the analysis.

Maternal place of birth outside Europe or North America was associated with increased risk of autism in 2 studies: 1 from Sweden (adjusted relative risk, 3.0)30 and 1 from Denmark (adjusted relative risk, 1.4).28

OBSTETRIC CONDITIONS

The obstetric conditions that appeared to increase risk of autism fell into 2 categories: (1) birth weight and gestational age at birth (ie, duration of pregnancy) and (2) intrapartum hypoxia. Low birth weight (LBW), defined as birth weight less than 2500 g, was examined in 5 studies,26,27,3032 but none have conferred LBW to be associated with increased risk of autism. Data on gestational age were reported in 4 studies.26,3032 Birth at less than 35 weeks was associated with increased risk of autism in 1 study32 (adjusted relative risk, 2.6). Being small for gestational age or having LBW or slow growth was associated with a 2-fold increase in risk in 2 studies (range of adjusted relative risk, 1.6-2.1).26,30 Birth weight and gestational age were combined in 1 study26 to reflect the joint effects of these 2 variables and formulated into a separate variable called weight or growth risk. One of the other studies32 found only gestational age at birth (adjusted relative risk, 1.3) but not LBW to be associated with autism.

Several obstetric variables may act as surrogates of fetal hypoxia, including low Apgar score, fetal distress, cesarean delivery, threatened abortion, and bleeding during pregnancy. Measures of hypoxia were examined in 4 of the 7 studies. Findings from all 4 studies suggested that an Apgar score of less than 7 predicts autism.26,3032 In 3 of the 4 studies, a low Apgar score remained a significant risk factor in the adjusted analyses (range of adjusted relative risk, 1.7-3.2).26,30,32

In 1 study, several pregnancy complications were associated with an increased risk of autism, including bleeding, cesarean delivery, and congenital malformations.30 Two of the 7 studies identified cesarean delivery as an independent risk factor for autism (range of adjusted relative risk, 1.6-1.8).30,31 In addition, a history of abortion26 or threatened abortion31 similarly increased the risk of autism. Finally, bleeding during pregnancy30 and fetal distress31 emerged as 2 other significant risk factors for autism in separate studies. Taken together, the studies suggest that hypoxia-related obstetric complications and fetal hypoxia may possibly increase the risk of autism.

According to our review, 3 parental characteristics and 2 obstetric conditions emerge as potential risk factors for autism: namely, paternal age, maternal age, maternal immigration, growth restriction, and newborn hypoxia. In analyses that adjusted for confounding variables, these factors usually remained statistically significant.

Several variables were interpreted to reflect hypoxia, however, including low Apgar score, fetal distress, cesarean delivery, maternal hypertension, and bleeding during pregnancy. In this section, we discuss the potential risk factors identified in this review and attempt to understand their etiological relevance to autism.

ADVANCED PATERNAL AGE

Several studies13,3439 of clinical samples have reported advanced paternal age in individuals with autism or childhood psychosis. The results of this review show that 3 of the 4 population-based studies28,29,32 to examine paternal age reported a significant association with risk of autism and ASDs. The fourth study31 also found that paternal age was older in fathers of case patients with autism compared with fathers of controls, although this relationship was statistically weaker in the adjusted analysis. Thus, advancing paternal age is consistently associated with increased risk of autism and ASDs.

Advanced paternal age has been associated with several congenital disorders, including Apert syndrome,40 craniosynostosis,41 situs inversus,42 syndactyly,43 cleft lip and/or palate,44,45 hydrocephalus,44 neural tube defects,46 and Down syndrome.47 In addition, advanced paternal age has been associated with schizophrenia15 and decreased intellectual capacities in the offspring.48 The most widely proposed mechanism underlying these congenital anomalies is known as the “copy error” hypothesis, first proposed by Penrose.49 After puberty, spermatocytes divide every 16 days, and by the age of 35 years, approximately 540 cell divisions have occurred. As a result, de novo genetic mutations that result from replication errors and defective DNA repair mechanisms are believed to propagate in successive clones of spermatocytes. These mutations accumulate with advancing paternal age and thus help explain how this disorder, which has a large genetic component, can be maintained in the population despite reduced reproduction in affected individuals.

ADVANCED MATERNAL AGE

Increased maternal age has also been associated with several developmental disorders, including Down syndrome,12 dyslexia,13 and mental retardation of unknown cause.14 Brain damage of the fetus or neonate may also be more likely to occur in older mothers.50 Early case-control studies25,34,51 of autism have reported mixed results with respect to a proposed association between advanced maternal age and autism. Our review indicated that 3 epidemiological studies26,27,31 found advancing maternal age to be associated with increased risk of autism or ASDs, although results are not consistent across studies. One of the 3 studies26 found maternal age to be specifically associated only with Asperger syndrome.

One possible mechanism for the association between advanced maternal age and neurological and psychiatric disorders involves nucleotide repeat instability.52 Trinucleotide or triplet repeats are 3 nucleotides consecutively repeated within a region of DNA and have been found to undergo a type of genetic mutation, termed a dynamic or expansion mutation. In this type of mutation, through mechanisms that occur during DNA replication and are only partially understood, the number of triplets in a repeat increases.53 Unlike repeats of normal length, in which length changes only rarely from one generation to the next, expanded repeats tend to be unstable and will typically become longer over successive generations. During the past decade, nearly 20 diseases caused by a trinucleotide repeat expansion have been identified, as well as other diseases caused by related mutations, including Huntington disease and fragile X syndrome. More recently, trinucleotide repeats have been associated with the risk of autism.54,55

MATERNAL IMMIGRATION

Two studies28,30 identified an increased risk of autism in children whose mothers were born outside Europe or North America. This finding is consistent with previous work by Gillberg and Gillberg56 in a Swedish population-based study to examine autism in immigrants. This increased risk has been suggested to indicate the presence of an underlying infectious cause because mothers may not receive immunizations in their new country and thereby lack immunity to certain infections during pregnancy that are otherwise uncommon in the country of origin.56,57 Another possible explanation for this effect is selective migration of people with genetic vulnerability to autism. This explanation would appear less likely, however, given that immigration requires integration into a new culture and acquisition of a new language, both skills that are presumably lacking in people with ASDs. However, Gillberg et al57 have suggested that men with social impairments may more easily establish an intimate relationship with someone from another country. This theory finds indirect support in work by Lauritsen et al,28 who examined parental countries of birth and found the effect of maternal country of origin to have a greater effect than paternal country of origin. However, the studies that demonstrated a maternal immigration effect in autism were conducted in Nordic countries. Sweden and Denmark may receive immigrants from similar countries, and replication in other geographic regions is necessary before these results can be generalized.

LBW AND GESTATIONAL AGE

Low birth weight is considered a marker for newborns at high risk for later neurological, psychiatric, and neuropsychological problems because it is a likely indicator of fetal growth problems and has been associated with prenatal risk factors, intrapartum complications, and neonatal disease.58 Low birth weight is a particularly attractive marker because it is measured routinely and rather accurately and has been associated with a variety of cognitive difficulties and psychiatric outcomes in children, including speech and language problems,16,17 internalizing problems, attention problems, social problems,1820 hyperactivity,21,22 and learning disabilities.59 There is also a substantial literature base on the relationship between LBW and intelligence. Most studies58,60 have demonstrated that, compared with normal-birth-weight children, LBW children have lower mean IQ scores. Recent studies61 further suggest that birth weight is associated with IQ across the entire birth weight range. However, our review suggests that LBW is not associated with increased risk of autism.

Low-birth-weight infants represent an etiologically heterogeneous group, and LBW is often an indicator of earlier intrauterine effects.62 Premature infants are also typically physically small, and therefore the association between birth weight and gestational age is important to consider. Similar to LBW, gestational age and particularly being small for gestational age have been associated with adverse health outcomes, including developmental delays and later intellectual impairments in childhood and adolescence.6365 Evidence from case-control studies that used clinical samples of autistic children to explore an association between gestational age and autism is not consistent. Abnormal gestational age, including prematurity and postmaturity, has been associated with an increased risk of autism in some25,51 but not all23,34,66 studies. Among the epidemiological studies within the scope of our review, only 4 examined gestational age as a potential risk factor for autism. Two studies30,32 found a significant association between being small for gestational age and autism, and another study26 found an increased risk of autism in very light or slow-growth infants. In summary, despite biological plausibility and fairly consistent findings that document a relationship between gestational age and the risk of autism, large population-based epidemiological samples with comprehensive data on potential confounders and plausible mediators are needed for a more conclusive investigation of these factors.

HYPOXIC CONDITIONS

Several investigators have hypothesized that a set of perinatal conditions that indicate prolonged or acute oxygen deprivation (hypoxia) to the fetus may be a major risk factor for neuropsychological and neuropsychiatric disturbances.6769 Murray and Harvey70 reported that 3 regions in the brain are especially vulnerable to perinatal insult, including the basal ganglia, the hippocampus, and the lateral ventricles. Neuroimaging studies71 have shown that the lateral ventricles in particular are larger in patients with autism compared with controls. Brains of individuals with autism have also been shown to exhibit morphological hippocampal abnormalities.72 Prenatal and perinatal conditions associated with fetal hypoxia are likely to be heterogeneous in origin73 and may include, in addition to overt fetal distress, conditions such as maternal hypertension, gestational diabetes, cord encircling of the neck, and prolonged labor.74,75

Some indirect evidence also supports an association between hypoxia and hypoxia-related conditions and autism. Juul-Dam et al66 found increased frequency of oxygen treatment among newborns who later developed autism and other pervasive developmental disorders, but this association was no longer significant after controlling for multiple comparisons. Similar results, although not statistically significant, were reported by Gillberg and Gillberg.25 Among the epidemiological studies reviewed in this article, increased frequency of several variables that may reflect hypoxia-related conditions was detected in case patients with autism. One study30 found significant associations with pregnancy-induced hypertension, bleeding, cesarean delivery, congenital malformations, and daily smoking during pregnancy. The association with cesarean delivery should be considered with caution because it might be confounded by the indication to perform cesarean delivery, such as a significant obstetric complication. Other studies identified provoked abortion,26 threatened abortion, and fetal distress as significant risk factors.31 However, most of these studies assessed only a few potentially hypoxic conditions.

Before concluding, several limitations of this review are worth noting. First, our results were based on a limited number of studies (7). Second, diagnostic criteria varied across studies and may now be considered outdated in some (eg, ICD-8 and DSM-III), although Madsen et al76 in their 2002 study on measles-mumps-rubella vaccination and autism found that a change in classification system from ICD-8 to ICD-10 did not have a major influence on the overall results. Similarly, the risk factors characterized in this review were evident across studies using different classification methods. Furthermore, case assessments typically did not include gold standard measures such as the Autism Diagnostic Interview–Revised77 or the Autism Diagnostic Observation Schedule-Generic,78 yet most studies report high reliability and validity of case sources. Third, our conclusions were based only on data collected and reported by the reviewed studies. Other potentially relevant risk factors may have been overlooked. Fourth, the generalizability of the identified risk factors is limited by the difficulty of applying conclusions drawn from diverse ethnic populations, especially with a vastly heterogeneous disease such as autism. Finally, the specificity of the results may be called into question because several other neurodevelopmental diseases, as noted, may likewise be associated with the identified risk factors.15,79

Future studies should continue to explore whether parental characteristics and obstetric conditions are associated with an increased risk of autism and ASDs. The parental characteristics identified through this review that are likely to have a true association with autism include advancing paternal and, to a lesser extent, advancing maternal age. Because of a growing body of evidence supporting the presence of abnormal fetal brain development in ASDs, future studies should investigate obstetric conditions such as newborn hypoxia and LBW. A broader autism phenotype, with characteristic social, language, and behavioral impairments, has been implicated. Future studies may also seek to assess the impact of prenatal and perinatal risk factors on dimensional outcomes related to the autism phenotype in the general population. Given the inconsistency present in some results, it is especially important for future studies to use large, population-based birth cohorts and to allow for precise and detailed assessments of exposures and potential confounders. Perhaps the most important potential confounder to consider is genetic susceptibility to autism. Genetic susceptibility, a well-known risk factor for autism, may be associated with obstetric suboptimality. To determine whether prenatal and perinatal exposures are independent risk factors for autism, a measure of genetic susceptibility should be included in future studies. To date there are no known genes for autism, and therefore a detailed family history should be sought.80 Such a history would allow for the assessment of genetic susceptibility as a confounder and would also help researchers examine the interaction of autism susceptibility genes with nonheritable, potentially preventable prenatal and perinatal risk factors for autism and ASDs.

Correspondence: Abraham Reichenberg, PhD, Department of Psychiatry, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1230, New York, NY 10029 (avi.reichenberg@mssm.edu).

Accepted for Publication: November 30, 2006.

Author Contributions:Study concept and design: Kolevzon, Gross, and Reichenberg. Acquisition of data: Reichenberg. Analysis and interpretation of data: Gross and Reichenberg. Drafting of the manuscript: Kolevzon, Gross, and Reichenberg. Critical revision of the manuscript for important intellectual content: Gross and Reichenberg. Statistical analysis: Kolevzon and Gross. Study supervision: Reichenberg.

Financial Disclosure: None reported.

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Tolarova  MMHarris  JAOrdway  DEVargervik  K Birth prevalence, mutation rate, sex ratio, parents' age, and ethnicity in Apert syndrome. Am J Med Genet 1997;72394- 398
PubMed Link to Article
Singer  SBower  CSouthall  PGoldblatt  J Craniosynostosis in Western Australia, 1980-1994: a population-based study. Am J Med Genet 1999;83382- 387
PubMed Link to Article
Lian  ZHZack  MMErickson  JD Paternal age and the occurrence of birth defects. Am J Hum Genet 1986;39648- 660
PubMed
Polednak  AP Paternal age in relation to selected birth defects. Hum Biol 1976;48727- 739
PubMed
Savitz  DASchwingl  PJKeels  MA Influence of paternal age, smoking, and alcohol consumption on congenital anomalies. Teratology 1991;44429- 440
PubMed Link to Article
Perry  TBFraser  FC Paternal age and congenital cleft lip and cleft palate. Teratology 1972;6241- 246
PubMed Link to Article
McIntosh  GCOlshan  AFBaird  PA Paternal age and the risk of birth defects in offspring. Epidemiology 1995;6282- 288
PubMed Link to Article
Jyothy  AKumar  KSMallikarjuna  GN  et al.  Parental age and the origin of extra chromosome 21 in Down syndrome. J Hum Genet 2001;46347- 350
PubMed Link to Article
Auroux  MRMayaux  MJGuihard-Moscato  MLFromantin  MBarthe  JSchwartz  D Paternal age and mental functions of progeny in man. Hum Reprod 1989;4794- 797
PubMed
Penrose  LS Parental age and mutation. Lancet 1955;2312- 313
Link to Article
Durkin  MVKaveggia  EGPendleton  ENeuhauser  GOpitz  JM Analysis of etiologic factors in cerebral palsy with severe mental retardation, I: analysis of gestational, parturitional and neonatal data. Eur J Pediatr 1976;12367- 81
PubMed Link to Article
Cryan  EByrne  MO'Donovan  AO'Callaghan  E A case-control study of obstetric complications and later autistic disorder. J Autism Dev Disord 1996;26453- 460
PubMed Link to Article
Kaytor  MDBurright  ENDuvick  LAZoghbi  HYOrr  HT Increased trinucleotide repeat instability with advanced maternal age. Hum Mol Genet 1997;62135- 2139
PubMed Link to Article
Pearson  CESinden  RRWells  RDedWarren  STed Slipped strand DNA, dynamic mutations, and human disease. Genetic Instabilities and Hereditary Neurological Diseases. San Diego, Calif Academic Press Inc1998;585- 621
Persico  AMD'Agruma  LMaiorano  N  et al.  Reelin gene alleles and haplotypes as a factor predisposing to autistic disorder. Mol Psychiatry 2001;6150- 159
PubMed Link to Article
Zhang  HLiu  XZhang  C  et al.  Reelin gene alleles and susceptibility to autism spectrum disorders. Mol Psychiatry 2002;71012- 1017
PubMed Link to Article
Gillberg  ICGillberg  C Autism in immigrants: a population-based study from Swedish rural and urban areas. J Intellect Disabil Res 1996;4024- 31
PubMed Link to Article
Gillberg  CSchaumann  HGillberg  IC Autism in immigrants: children born in Sweden to mothers born in Uganda. J Intellect Disabil Res 1995;39141- 144
PubMed Link to Article
Breslau  N Psychiatric sequelae of low birth weight. Epidemiol Rev 1995;1796- 106
PubMed
Johnson  EOBreslau  N Increased risk of learning disabilities in low birth weight boys at age 11 years. Biol Psychiatry 2000;47490- 500
PubMed Link to Article
Aylward  GPPfeiffer  SIWright  AVerhulst  SJ Outcome studies of low birth weight infants published in the last decade: a metaanalysis. J Pediatr 1989;115515- 520
PubMed Link to Article
Matte  TDBresnahan  MBegg  MDSusser  E Influence of variation in birth weight within normal range and within sibships on IQ at age 7 years: cohort study. BMJ 2001;323310- 314
PubMed Link to Article
Wilcox  AJ On the importance–and the unimportance–of birthweight. Int J Epidemiol 2001;301233- 1241
PubMed Link to Article
Hack  MFlannery  DJSchluchter  MCartar  LBorawski  EKlein  N Outcomes in young adulthood for very-low-birth-weight infants. N Engl J Med 2002;346149- 157
PubMed Link to Article
Paz  ILaor  AGale  RHarlap  SStevenson  DKSeidman  DS Term infants with fetal growth restriction are not at increased risk for low intelligence scores at age 17 years. J Pediatr 2001;13887- 91
PubMed Link to Article
Harvey  DPrince  JBunton  JParkinson  CCampbell  S Abilities of children who were small-for-gestational-age babies. Pediatrics 1982;69296- 300
PubMed
Juul-Dam  NTownsend  JCourchesne  E Prenatal, perinatal, and neonatal factors in autism, pervasive developmental disorder-not otherwise specified, and the general population. Pediatrics 2001;107e63
PubMed Link to Article
Naeye  RLPeters  EC Antenatal hypoxia and low IQ values. AJDC 1987;14150- 54
PubMed
Msall  MEBier  JALaGasse  LTremont  MLester  B The vulnerable preschool child: the impact of biomedical and social risks on neurodevelopmental function. Semin Pediatr Neurol 1998;552- 61
PubMed Link to Article
Robertson  CMFiner  NN Long-term follow-up of term neonates with perinatal asphyxia. Clin Perinatol 1993;20483- 500
PubMed
Murray  RMHarvey  I The congenital origins of schizophrenia. Psychiatr Ann 1989;19525- 529
Link to Article
Piven  JArndt  SBailey  JHavercamp  SAndreasen  NCPalmer  P An MRI study of brain size in autism. Am J Psychiatry 1995;1521145- 1149
PubMed
Kemper  TLBauman  MLNaruse  HedOrnitz  EMed Neuropathology of infantile autism. Neurobiology of Infantile Autism. Amsterdam, the Netherlands Elsevier Science Publisher1992;43- 57
Zornberg  GLBuka  SLTsuang  MT Hypoxic-ischemia-related fetal/neonatal complications and risk of schizophrenia and other nonaffective psychoses: a 19-year longitudinal study. Am J Psychiatry 2000;157196- 202
PubMed Link to Article
Cannon  TDRosso  IMHollister  JMBearden  CESanchez  LEHadley  T A prospective cohort study of genetic and perinatal influences in the etiology of schizophrenia. Schizophr Bull 2000;26351- 366
PubMed Link to Article
Seidman  LJBuka  SLGoldstein  JMHorton  NJRieder  ROTsuang  MT The relationship of prenatal and perinatal complications to cognitive functioning at age 7 in the New England Cohorts of the National Collaborative Perinatal Project. Schizophr Bull 2000;26309- 321
PubMed Link to Article
Madsen  KMHviid  AVestergaard  M  et al.  A population-based study of measles, mumps, and rubella vaccination and autism. N Engl J Med 2002;3471477- 1482
PubMed Link to Article
Lord  CRutter  MLe Couteur  A Autism Diagnostic Interview–Revised: a revised version of a diagnostic interview for caregivers of individuals with possible per-vasive developmental disorders. J Autism Dev Disord 1994;24659- 685
PubMed Link to Article
Lord  CRisi  SLambrecht  L  et al.  The autism diagnostic observation schedule-generic: a standard measure of social and communication deficits associated with the spectrum of autism. J Autism Dev Disord 2000;30205- 223
PubMed Link to Article
Cannon  MJones  PBMurray  RM Obstetric complications and schizophrenia: historical and meta-analytic review. Am J Psychiatry 2002;1591080- 1092
PubMed Link to Article
Larsson  HJEaton  WWMadsen  KM  et al.  Risk factors for autism-perinatal factors, parental psychiatric history, and socioeconomic status. Am J Epidemiol 2005;161926- 928
Link to Article

Figures

Tables

Table Graphic Jump LocationTable 1. Prospective Population-Based Cohort Studies Included in the Review of the Association Between Obstetric Complications and Autism or ASDs
Table Graphic Jump LocationTable 2. Population-Based Case-Control Studies Included in the Review of the Association Between Obstetric Complications and Autism or ASDs

References

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Veen  SEns-Dokkum  MHSchreuder  AMVerloove-Vanhorick  SPBrand  RRuys  JH Impairments, disabilities, and handicaps of very preterm and very-low-birthweight infants at five years of age: the Collaborative Project on Preterm and Small for Gestational Age Infants (POPS) in the Netherlands. Lancet 1991;33833- 36
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Eaton  WWMortensen  PBThomsen  PHFrydenberg  M Obstetric complications and risk for severe psychopathology in childhood. J Autism Dev Disord 2001;31279- 285
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Croen  LAGrether  JKSelvin  S Descriptive epidemiology of autism in a California population: who is at risk? J Autism Dev Disord 2002;32217- 224
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Lauritsen  MBPedersen  CBMortensen  PB Effects of familial risk factors and place of birth on the risk of autism: a nationwide register-based study. J Child Psychol Psychiatry 2005;46963- 971
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Reichenberg  AGross  RWeiser  M  et al.  Advancing paternal age and autism. Arch Gen Psychiatry 2006;631026- 1032
PubMed Link to Article
Hultman  CMSparen  PCnattingius  S Perinatal risk factors for infantile autism. Epidemiology 2002;13417- 423
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Glasson  EJBower  CPetterson  BDe Klerk  NChaney  GHallmayer  JF Perinatal factors and the development of autism: a population study. Arch Gen Psychiatry 2004;61618- 627
PubMed Link to Article
Larsson  HJEaton  WWMadsen  KM  et al.  Risk factors for autism: perinatal factors, parental psychiatric history, and socioeconomic status. Am J Epidemiol 2005;161916- 928
PubMed Link to Article
Mason-Brothers  ARitvo  ERPingree  C  et al.  The UCLA-University of Utah epidemiologic survey of autism: prenatal, perinatal, and postnatal factors. Pediatrics 1990;86514- 519
PubMed
Burd  LSeverud  RKerbeshian  JKlug  MG Prenatal and perinatal risk factors for autism. J Perinat Med 1999;27441- 450
PubMed
Allen  JDeMeyer  MKNorton  JAPontius  WYang  E Intellectuality in parents of psychotic, subnormal, and normal children. J Autism Child Schizophr 1971;1311- 326
PubMed Link to Article
Treffert  DA Epidemiology of infantile autism. Arch Gen Psychiatry 1970;22431- 438
PubMed Link to Article
Gillberg  C Parental age in child psychiatric clinic attenders. Acta Psychiatr Scand 1982;66471- 478
PubMed
Mouridsen  SERich  BIsager  T Brief report: parental age in infantile autism, autistic-like conditions, and borderline childhood psychosis. J Autism Dev Disord 1993;23387- 396
PubMed Link to Article
Piven  JPalmer  P Psychiatric disorder and the broad autism phenotype: evidence from a family study of multiple-incidence autism families. Am J Psychiatry 1999;156557- 563
PubMed
Tolarova  MMHarris  JAOrdway  DEVargervik  K Birth prevalence, mutation rate, sex ratio, parents' age, and ethnicity in Apert syndrome. Am J Med Genet 1997;72394- 398
PubMed Link to Article
Singer  SBower  CSouthall  PGoldblatt  J Craniosynostosis in Western Australia, 1980-1994: a population-based study. Am J Med Genet 1999;83382- 387
PubMed Link to Article
Lian  ZHZack  MMErickson  JD Paternal age and the occurrence of birth defects. Am J Hum Genet 1986;39648- 660
PubMed
Polednak  AP Paternal age in relation to selected birth defects. Hum Biol 1976;48727- 739
PubMed
Savitz  DASchwingl  PJKeels  MA Influence of paternal age, smoking, and alcohol consumption on congenital anomalies. Teratology 1991;44429- 440
PubMed Link to Article
Perry  TBFraser  FC Paternal age and congenital cleft lip and cleft palate. Teratology 1972;6241- 246
PubMed Link to Article
McIntosh  GCOlshan  AFBaird  PA Paternal age and the risk of birth defects in offspring. Epidemiology 1995;6282- 288
PubMed Link to Article
Jyothy  AKumar  KSMallikarjuna  GN  et al.  Parental age and the origin of extra chromosome 21 in Down syndrome. J Hum Genet 2001;46347- 350
PubMed Link to Article
Auroux  MRMayaux  MJGuihard-Moscato  MLFromantin  MBarthe  JSchwartz  D Paternal age and mental functions of progeny in man. Hum Reprod 1989;4794- 797
PubMed
Penrose  LS Parental age and mutation. Lancet 1955;2312- 313
Link to Article
Durkin  MVKaveggia  EGPendleton  ENeuhauser  GOpitz  JM Analysis of etiologic factors in cerebral palsy with severe mental retardation, I: analysis of gestational, parturitional and neonatal data. Eur J Pediatr 1976;12367- 81
PubMed Link to Article
Cryan  EByrne  MO'Donovan  AO'Callaghan  E A case-control study of obstetric complications and later autistic disorder. J Autism Dev Disord 1996;26453- 460
PubMed Link to Article
Kaytor  MDBurright  ENDuvick  LAZoghbi  HYOrr  HT Increased trinucleotide repeat instability with advanced maternal age. Hum Mol Genet 1997;62135- 2139
PubMed Link to Article
Pearson  CESinden  RRWells  RDedWarren  STed Slipped strand DNA, dynamic mutations, and human disease. Genetic Instabilities and Hereditary Neurological Diseases. San Diego, Calif Academic Press Inc1998;585- 621
Persico  AMD'Agruma  LMaiorano  N  et al.  Reelin gene alleles and haplotypes as a factor predisposing to autistic disorder. Mol Psychiatry 2001;6150- 159
PubMed Link to Article
Zhang  HLiu  XZhang  C  et al.  Reelin gene alleles and susceptibility to autism spectrum disorders. Mol Psychiatry 2002;71012- 1017
PubMed Link to Article
Gillberg  ICGillberg  C Autism in immigrants: a population-based study from Swedish rural and urban areas. J Intellect Disabil Res 1996;4024- 31
PubMed Link to Article
Gillberg  CSchaumann  HGillberg  IC Autism in immigrants: children born in Sweden to mothers born in Uganda. J Intellect Disabil Res 1995;39141- 144
PubMed Link to Article
Breslau  N Psychiatric sequelae of low birth weight. Epidemiol Rev 1995;1796- 106
PubMed
Johnson  EOBreslau  N Increased risk of learning disabilities in low birth weight boys at age 11 years. Biol Psychiatry 2000;47490- 500
PubMed Link to Article
Aylward  GPPfeiffer  SIWright  AVerhulst  SJ Outcome studies of low birth weight infants published in the last decade: a metaanalysis. J Pediatr 1989;115515- 520
PubMed Link to Article
Matte  TDBresnahan  MBegg  MDSusser  E Influence of variation in birth weight within normal range and within sibships on IQ at age 7 years: cohort study. BMJ 2001;323310- 314
PubMed Link to Article
Wilcox  AJ On the importance–and the unimportance–of birthweight. Int J Epidemiol 2001;301233- 1241
PubMed Link to Article
Hack  MFlannery  DJSchluchter  MCartar  LBorawski  EKlein  N Outcomes in young adulthood for very-low-birth-weight infants. N Engl J Med 2002;346149- 157
PubMed Link to Article
Paz  ILaor  AGale  RHarlap  SStevenson  DKSeidman  DS Term infants with fetal growth restriction are not at increased risk for low intelligence scores at age 17 years. J Pediatr 2001;13887- 91
PubMed Link to Article
Harvey  DPrince  JBunton  JParkinson  CCampbell  S Abilities of children who were small-for-gestational-age babies. Pediatrics 1982;69296- 300
PubMed
Juul-Dam  NTownsend  JCourchesne  E Prenatal, perinatal, and neonatal factors in autism, pervasive developmental disorder-not otherwise specified, and the general population. Pediatrics 2001;107e63
PubMed Link to Article
Naeye  RLPeters  EC Antenatal hypoxia and low IQ values. AJDC 1987;14150- 54
PubMed
Msall  MEBier  JALaGasse  LTremont  MLester  B The vulnerable preschool child: the impact of biomedical and social risks on neurodevelopmental function. Semin Pediatr Neurol 1998;552- 61
PubMed Link to Article
Robertson  CMFiner  NN Long-term follow-up of term neonates with perinatal asphyxia. Clin Perinatol 1993;20483- 500
PubMed
Murray  RMHarvey  I The congenital origins of schizophrenia. Psychiatr Ann 1989;19525- 529
Link to Article
Piven  JArndt  SBailey  JHavercamp  SAndreasen  NCPalmer  P An MRI study of brain size in autism. Am J Psychiatry 1995;1521145- 1149
PubMed
Kemper  TLBauman  MLNaruse  HedOrnitz  EMed Neuropathology of infantile autism. Neurobiology of Infantile Autism. Amsterdam, the Netherlands Elsevier Science Publisher1992;43- 57
Zornberg  GLBuka  SLTsuang  MT Hypoxic-ischemia-related fetal/neonatal complications and risk of schizophrenia and other nonaffective psychoses: a 19-year longitudinal study. Am J Psychiatry 2000;157196- 202
PubMed Link to Article
Cannon  TDRosso  IMHollister  JMBearden  CESanchez  LEHadley  T A prospective cohort study of genetic and perinatal influences in the etiology of schizophrenia. Schizophr Bull 2000;26351- 366
PubMed Link to Article
Seidman  LJBuka  SLGoldstein  JMHorton  NJRieder  ROTsuang  MT The relationship of prenatal and perinatal complications to cognitive functioning at age 7 in the New England Cohorts of the National Collaborative Perinatal Project. Schizophr Bull 2000;26309- 321
PubMed Link to Article
Madsen  KMHviid  AVestergaard  M  et al.  A population-based study of measles, mumps, and rubella vaccination and autism. N Engl J Med 2002;3471477- 1482
PubMed Link to Article
Lord  CRutter  MLe Couteur  A Autism Diagnostic Interview–Revised: a revised version of a diagnostic interview for caregivers of individuals with possible per-vasive developmental disorders. J Autism Dev Disord 1994;24659- 685
PubMed Link to Article
Lord  CRisi  SLambrecht  L  et al.  The autism diagnostic observation schedule-generic: a standard measure of social and communication deficits associated with the spectrum of autism. J Autism Dev Disord 2000;30205- 223
PubMed Link to Article
Cannon  MJones  PBMurray  RM Obstetric complications and schizophrenia: historical and meta-analytic review. Am J Psychiatry 2002;1591080- 1092
PubMed Link to Article
Larsson  HJEaton  WWMadsen  KM  et al.  Risk factors for autism-perinatal factors, parental psychiatric history, and socioeconomic status. Am J Epidemiol 2005;161926- 928
Link to Article

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