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Article |

Prevalence of Antihypertensive, Antidiabetic, and Dyslipidemic Prescription Medication Use Among Children and Adolescents FREE

Joshua N. Liberman, PhD; Jan E. Berger, MD; Meredith Lewis, BS
[+] Author Affiliations

Author Affiliations: Department of Analytics & Outcomes, CVS Caremark, Hunt Valley, Maryland (Dr Liberman and Ms Lewis), and Northbrook, Illinois (Dr Berger). Dr Berger is now with Health Intelligence Partners, Chicago, Illinois.


Arch Pediatr Adolesc Med. 2009;163(4):357-364. doi:10.1001/archpediatrics.2009.5.
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Published online

Objective  To document trends in the use of prescription medications indicated for types 1 and 2 diabetes mellitus, hypertension, and dyslipidemia among children and adolescents.

Design  Serial, cross-sectional study.

Setting  Age-eligible children and adolescents with prescription drug benefits managed by CVS Caremark, a pharmacy benefits manager.

Participants  Commercially insured US children and adolescents aged 6 to 18 years. Population size varied by month from approximately 5.3 million to 6 million individuals.

Main Outcome Measure  Monthly prevalence of prescription drug use, measured from September 1, 2004, through June 30, 2007.

Results  The 1-month prevalence of antihypertensive, dyslipidemic, or oral antidiabetic medication or insulin use increased 15.2% from 3.3 per 1000 youths in November 2004 to 3.8 per 1000 youths in June 2007. The 16- to 18-year-olds had the highest prevalence overall, but the greatest rate of increase was found among 6- to 11-year-olds: 18.7% for girls and 17.3% for boys. Among antihypertensive medications, β-blockers had the highest prevalence (1.5 per 1000 youths), followed by angiotensin-converting enzyme inhibitors, diuretics, calcium channel blockers, and angiotensin II receptor blockers. For 6- to 11-year-olds, angiotensin-converting enzyme inhibitor use increased 27.7% among girls and 25.2% among boys. Dyslipidemia therapy, which was dominated by statin use, declined 22.9%.

Conclusions  The increasing use of oral antidiabetic and antihypertensive pharmacotherapy among children and adolescents, especially in the younger age group, indicates either an increased awareness of treatment needs or increased incidence of cardiovascular risk factors typically associated with adult populations. The decrease in treatment of dyslipidemia may reflect the ongoing controversy regarding statin use.

Figures in this Article

Overweight and obesity have reached epidemic proportions in the United States. An estimated 32.2% of the adult population are obese, and 66.3% are overweight or obese.1 Excessive weight among American children and adolescents has also reached epidemic proportions.2,3 Analysis of responses from the 2003-2004 National Health and Nutrition Examination Survey projects that 18.8% of children aged 6 to 11 years and 17.4% of adolescents aged 12 to 19 years are overweight or obese, an increase of 24.5% and 17.6%, respectively, in the 4 years since the 1999-2000 National Health and Nutrition Examination Survey.1,4

The greater incidence of serious chronic health conditions, such as diabetes mellitus, hypertension, and asthma, among the overweight population, as well as the realization that children and adolescents are not immune to obesity, has led to calls for immediate action.57 Overweight children and adolescents have substantially elevated rates of prehypertension and hypertension, impaired glucose tolerance and insulin resistance syndrome, type 2 diabetes mellitus, and vascular abnormalities.3,813 Although clinical definitions, time frames, and age ranges vary across studies, recent epidemiologic investigations estimate the prevalence of pediatric hypertension to be between 2.2% and 13.8%, type 2 diabetes to be between 0.15% and 0.22%, impaired fasting glucose level to be 11%, high total cholesterol level (≥200 mg/dL [to convert to millimoles per liter, multiply by 0.259]) to be 4.0%, and metabolic syndrome to be between 4.2% and 12.7%.8,1422

Therapeutic regimens for pediatric overweight, hypertension, type 2 diabetes, and dyslipidemia emphasize lifestyle changes, including increased exercise, reduced caloric intake, and improved nutrition. These recommendations align with the American Heart Association and American Academy of Pediatrics general dietary recommendations and primary prevention guidelines.2327 Unfortunately, lifestyle and behavioral modifications frequently fail to produce substantial or sustained weight loss,28 and, thus, guidelines also recommend early initiation of pharmacotherapy.25 Despite these recommendations, the prevalence of pediatric antihypertensive, dyslipidemic, and oral antidiabetic medication use is not well documented. The objective of this study is to describe the current prevalence of and recent trends in the distribution of antihypertensive, antidiabetic, and dyslipidemia prescription medication use among an insured population of US children and adolescents.

The prevalence rates among commercially insured children and adolescents aged 6 to 18 years in the United States were measured monthly from September 1, 2004, through June 30, 2007. The eligible study population and associated prescription drug use were derived from benefits eligibility and administrative prescription claims data sets managed by CVS Caremark, a prescription benefits manager. Prescription benefits managers provide health plans, self-insured employers, and other entities, herein referred to as “payers,” with services to support the management and administration of prescription health benefits. In this role, CVS Caremark adjudicates retail and mail service prescription claims submitted by insured individuals and their beneficiaries. The sampling frame includes 93 health plans, 785 employers, and 243 other organizations that provided CVS Caremark pharmacy insurance throughout the study period. All eligible pediatric plan participants were identified for each month in the study period.

Prevalence rates measure the proportion of the population filling prescriptions for selected medications. For a given month, the prevalence rate was the number of age-eligible individuals with a prescription for a selected medication divided by the total age-eligible population. The total age-eligible population was defined as all individuals within the selected age group, with age calculated on the last date of the month and eligibility for prescription benefits at any point during the month. Prescription use was defined as a minimum of 15 days of available therapy in the month (calculated by a consecutive count of days' supply of medication dispensed from the fill date of the most recent prescription). Days' supply of medication was censored as of a plan participant's 19th birthday or the date that prescription benefit eligibility was discontinued.

All treatment prevalence rates were calculated per 1000 participants per month and were calculated overall and by age group (6-11, 12-15, and 16-18 years) for selected therapeutic classes (Table 1). Therapeutic classes were defined according to the Generic Product Identifier, a proprietary, hierarchical therapeutic classification scheme used to denote pharmaceutically equivalent drug products (Medi-Span; Wolters Kluwer Health, Indianapolis, Indiana). Generic Product Identifiers are 14-digit codes that define drug group, class, subclass, name, name extension, dosage form, and strength; the first 4 digits define group (digits 1 and 2) and drug class (digits 3 and 4). Prevalence rates are displayed monthly, with each month representing the average of the previous 3 months' prevalence rates.

Table Graphic Jump LocationTable 1. Drug Classifications Included in the Analysis

The protocol was reviewed and approved by the Essex Institutional Review Board (Lebanon, New Jersey).

The study population size varied by month, ranging from approximately 5.3 million to 6 million individuals. Age and sex distributions were similar to the projected US Census proportions, with girls representing about 51% of the study group and children aged 6 to 11 years representing 44% compared with adolescents aged 12 to 15 years (32%) and 16 to 18 years (24%). The relative proportion of each age and sex group varied slightly across the study period. As a result of the distribution of eligible CVS Caremark payers, the study population's geographic distribution differed from US Census projections (Table 2).

Table Graphic Jump LocationTable 2. Select Demographic Characteristics Over Timea

Overall, the use of any antihypertensive, dyslipidemic, insulin, or oral antidiabetic medication increased from 3.3 per 1000 youths in November 2004 to 3.8 per 1000 youths in June 2007, an increase of 15.2%. With an overall treatment prevalence of 0.2 per 1000 youths, dyslipidemia medication use was uncommon, and the treatment prevalence decreased in all age and sex groups (from 14% to 20%) except for among 16- to 18-year-old girls, whose use of dyslipidemics increased by 14%. Statin therapy represented approximately 56.9% of all dyslipidemia medication use, and prevalence of statin use decreased by 22.9% during the study period (Table 3 and Figure 1).

Place holder to copy figure label and caption
Figure 1.

Prevalence of insulin (A), oral antidiabetic (B), diuretic (C), and statin (D) use from November 2004 to June 2007 by age and sex groups.

Graphic Jump Location
Table Graphic Jump LocationTable 3. Treatment Prevalence as of April to June 2007 by Age, Sex, and Drug Classa

As of June 30, 2007, treatment prevalence for oral antidiabetics was 0.5 per 1000 youths. Oral antidiabetic use was highest among 16- to 18-year-old girls (0.14 per 1000), a rate 214% higher than among 16- to 18-year-old boys. As the first-line pharmacologic option for patients with type 2 diabetes, metformin (biguanides class) dominated the oral antidiabetic treatment category, representing approximately 73% of pharmacotherapy; prevalence of metformin use increased by 24.9% during the study period. In selected subgroups, the use of medications from several other pharmacologic classes more than doubled, including sulfonylurea use among 6- to 11-year-old girls, α-glucosidase inhibitor and insulin-sensitizing agent use among 6- to 11-year-old boys, and α-glucosidase inhibitor use among 16- to 18-year-old boys (Table 3 and Figure 1).

Insulin treatment prevalence was 1.5 per 1000 youths and was highest among 16- to 18-year-old boys (2.2 per 1000), followed by 16- to 18-year-old girls and 12- to 15-year-old boys (each at 1.8 per 1000). Each age and sex group realized substantial increases in insulin use, with increases among 6- to 11-year-old girls, 6- to 11-year-old boys, and 16- to 18-year-old boys exceeding 15%. Approximately 30.5% of insulin users concomitantly used oral antidiabetic medication. From November 2004 to June 2007, insulin use alone increased by 14.8%, and insulin use in conjunction with oral antidiabetic use increased by 23.3%.

The prevalence of any antihypertensive medication use was 1.5 per 1000 youths. The highest treatment prevalence rate was noted for β-blockers (0.6 per 1000 youths), followed by angiotensin-converting enzyme (ACE) inhibitors (0.5 per 1000 youths), diuretics (0.3 per 1000 youths), calcium channel blockers (0.2 per 1000 youths), angiotensin II receptor blockers (ARBs), and, finally, other antihypertensive medications (0.06 per 1000 youths). The use of cardioselective and nonselective β-blockers was comparable (0.29 vs 0.27 per 1000 youths). Concomitant antihypertensive therapy use occurred in 11.2% of treated children and adolescents.

In all antihypertensive classes, treatment prevalence increased with age, and several varied by sex. Among 6- to 11-year-olds, overall treatment prevalence was 0.7 per 1000 among girls and 0.9 per 1000 among boys, increasing to approximately 1.5 per 1000 among 12- to 15-year-olds and then to 2.9 and 2.5 per 1000 among 16- to 18-year-old girls and boys, respectively. Among 6- to 11-year-olds, ACE inhibitors and β-blockers were the most frequently used medications; however, during the study period, ACE inhibitor use increased 27.7% and 25.2% for girls and boys, respectively, while β-blocker use increased only 3.0% and 7.0% in the same period. In general, girls had higher rates of β-blocker and diuretic use, whereas boys had higher rates of ACE inhibitor, ARB, and other antihypertensive medication use (Table 3 and Figure 2).

Place holder to copy figure label and caption
Figure 2.

Prevalence of angiotensin II receptor blocker (A), angiotensin-converting enzyme inhibitor (B), cardioselective β-blocker (C), and calcium channel blocker (D) use from November 2004 to June 2007 by age and sex groups.

Graphic Jump Location

The increasing recognition of a pediatric obesity epidemic has focused attention on type 2 diabetes mellitus, primary hypertension, and dyslipidemia among children and adolescents. Consensus treatment guidelines for these conditions recommend pharmaceuticals if lifestyle and behavioral modifications fail to achieve therapeutic goals, except among certain high-risk subgroups that warrant pharmacotherapy upon diagnosis. Yet, there is little information about the use of recommended pharmacotherapies. In our population of commercially insured children and adolescents, the treatment prevalence of prescription medications indicated for the management of hypertension and types 1 and 2 diabetes varied substantially by condition. However, antidiabetic and antihypertensive medication use increased markedly from November 2004 through June 2007, whereas the use of dyslipidemic medications decreased markedly during the same period. As expected, the oldest ages had the highest prevalence overall, yet the greatest rate of increase during this period was realized by 6- to 11-year-old children, with increases of 18.7% and 17.3% for girls and boys, respectively.

In 2001, the SEARCH for Diabetes in Youth Study, estimated type 1 diabetes prevalence (among 10- to 19-year-olds) at 2.3 per 1000 youths and type 2 diabetes prevalence at 0.4 per 1000 youths.19 Insulin is the primary pharmacologic option for type 1 diabetes. For type 2 diabetes, the American Diabetes Association and European Association for the Study of Diabetes guidelines recommend metformin (included in Generic Product Identifier class 2725, biguanides) as the pharmacologic therapy to be initiated upon diagnosis, with adjunctive therapy (insulin, sulfonylurea, or thiazolidinedione) added within 3 months if adequate glycemic control is not achieved.25 As of June 2007, the overall insulin prevalence rate was 1.5 per 1000 youths and the oral antidiabetic medication rate was 0.5 per 1000 youths, representing increases of 17.2% and 23.3%, respectively, since November 2004.

Although antidiabetic medication prescriptions are often written by pediatricians, in a survey of 199 pediatricians, Ditmyer et al29(p917) report that only 15.3% “believed they were well prepared and confident to treat and counsel” their patients with type 2 diabetes. Underdiagnosis and undertreatment of pediatric type 2 diabetes will lead to significant increases in disease complications and associated costs of care. As such, optimizing the use of antidiabetic pharmacotherapy has received significant focus in quality improvement initiatives such as HEDIS (Healthcare Effectiveness Data and Information Set) and pay-for-performance programs such as Bridges to Excellence.30We recommend enhancing efforts to educate primary care pediatricians regarding optimal patient screening, lifestyle and behavioral management, and the full range of pharmaceutical options available for treatment.

With the well-documented increase in overweight and obesity among children and adolescents, primary hypertension has also become a significant health issue.31,32 Hypertension is a common, often asymptomatic condition that affects between 2% to 5% of children and adolescents.14,16 The current consensus treatment guidelines recommend lifestyle modification, including a healthier, lower calorie diet and regular exercise, for all children with hypertension or prehypertension. In addition, pharmacologic therapy is recommended for select children with hypertension or prehypertension, and recommendations vary by blood pressure level, persistence, etiology, and the presence of select comorbidities.24 The guidelines recommend initiating monotherapy with medication from one of the following classes: ACE inhibitors, ARBs, β-blockers, calcium channel blockers, and diuretics.

Relative to the projected prevalence of hypertension,14,16 we found a low rate of antihypertensive use (1.5 per 1000 youths or 0.15%). The most frequently prescribed classes were β-blockers and ACE inhibitors, whereas ARB use remained relatively infrequent. However, during the study period, antihypertensive use increased by 15.3% overall, with the greatest increases noted for ACE inhibitors (24.7%) and diuretics (21.6%). Also, in accordance with treatment recommendations, we found low rates of concomitant therapy or antihypertensive combination use. The most dramatic rates of increases were noted among the 6- to 11-year-old population, regardless of sex, with treatment prevalence rates increasing by more than 20% for β-blockers, calcium channel blockers, ACE inhibitors, ARBs, and diuretics. Although overall treatment rates remain low relative to projected disease prevalence, the substantial increase in treatment prevalence may reflect an increasing awareness of existing hypertension in children and adolescents (a correction for underdiagnosis and undertreatment suggested by recent studies) rather than a response to an overall increase in pediatric hypertension.33 Despite the well-documented relationship between excessive weight and hypertension, a recent meta-analysis by Chiolero et al34(p550) concludes that available data “do not support the hypothesis that the worldwide epidemic of overweight in children has resulted in a commensurate increase in BP [blood pressure] levels in children.”

With high triglyceride levels and low high-density lipoprotein cholesterol levels occurring in 23.4% and 23.3% of adolescents in the United States, dyslipidemia is extremely common20 and is strongly associated with atherosclerotic processes.12 Yet, the US Preventive Services Task Force concludes there is insufficient evidence to recommend for or against screening for lipid disorders in anyone younger than 20 years of age,35 whereas the American Heart Association, American Academy of Pediatrics, American College of Obstetricians and Gynecologists, and the National Cholesterol Education Program report on Expert Panel of Cholesterol Levels in Children and Adolescents recommend selective screening of high-risk populations,36 and the American Diabetes Association recommends biannual screening beginning at diagnosis for patients with type 2 diabetes and beginning at age 10 years for patients with type 1 diabetes.37,38 National Cholesterol Education Program guidelines, developed in 1992, recommend initiating pharmacotherapy with bile acid sequestrants, whereas more recent recommendations incorporate statin therapy, with selective use of fibric acid derivates and cholesterol absorption inhibitors.26,28,37,39 In our study, statins were the most common preferred treatment, representing 63% of all pharmacotherapy. However, statin use decreased, whereas use of other dyslipidemic treatments increased. Although several statin drugs have pediatric labeling from the Food and Drug Administration, their use in this population remains controversial, and concerns have been raised about adverse effects and the unknown effects of long-term use.40 The decreasing treatment rate may also be the result of 2 highly publicized Food and Drug Administration warnings regarding rhabdomyolysis, a rare but potentially fatal adverse effect of statin use.41

The most compelling aspect of this analysis is the study population, which represents nearly 11% of the projected US population in these age groups. Based on 2000 US Census data, we project that 175 710 children and adolescents aged 6 to 18 years are actively being treated with an antidiabetic, antihypertensive, or dyslipidemic medication as of June 2007. After accounting for concomitant therapy, which occurs in 4.3% of this population, we project that 78 361 are being treated with insulin, 23 358 with oral antidiabetic medication, and 79 055 with antihypertensive medication (30 276 with β-blockers and 24 350 with ACE inhibitors). In comparison, a projected 150 000 children and adolescents in the United States have diabetes mellitus,19 and 1.1 to 2.6 million children have elevated blood pressure (derived from the 2% to 5% prevalence estimate14,16 applied to the estimated 53.2 million children and adolescents aged 6 to 18 years from the 2000 US Census). Furthermore, according to the Third National Health and Nutrition Examination Survey estimates of triglyceride and high-density lipoprotein cholesterol levels,20 more than 7 million adolescents aged 12 to 19 years may have dyslipidemia.

The study limitations relate primarily to the sampling frame and data source. First, the study sample is drawn from a predominantly commercially insured population, and, thus, generalizing from these results must be based on the assumption of equal access to and use of these pharmacotherapies among underinsured and uninsured children and adolescents. Second, in the absence of a definitive diagnosis and insight into specific treatment regimens as well as prescriber intent, we are left to speculate on the conditions being treated. Finally, in the absence of prescriber intent and patient characteristics, we are also left to speculate on the cause of the changing treatment patterns over time. Given this, we believe that future investigations should focus on patient adherence to therapy and pharmacovigilance and address prescriber screening and diagnostic practices, health care provider proficiency in the treatment of chronic cardiovascular disease, and interventions to achieve therapeutic goals.

The increasing use of oral antidiabetic and antihypertensive pharmacotherapy in pediatric populations, especially among a younger age group, indicates either an increased awareness of treatment needs or increased incidence of cardiovascular risk factors typically associated with adult populations. The decreasing rate of treatment for dyslipidemia may reflect the ongoing controversy regarding statin use.

Correspondence: Joshua N. Liberman, PhD, Department of Analytics & Outcomes, CVS Caremark, 11311 McCormick Rd, Ste 230, Hunt Valley, MD 21031 (Josh.Liberman@Caremark.com).

Accepted for Publication: September 2, 2008.

Author Contributions: Drs Liberman and Berger had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Liberman and Berger. Acquisition of data: Liberman and Lewis. Analysis and interpretation of data: Liberman, Berger, and Lewis. Drafting of the manuscript: Liberman. Critical revision of the manuscript for important intellectual content: Berger and Lewis. Statistical analysis: Liberman and Lewis. Administrative, technical, and material support: Liberman. Study supervision: Liberman and Berger.

Financial Disclosure: None reported.

Additional Contributions: Judith Ricci, ScD, provided helpful suggestions on the text.

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Figures

Place holder to copy figure label and caption
Figure 1.

Prevalence of insulin (A), oral antidiabetic (B), diuretic (C), and statin (D) use from November 2004 to June 2007 by age and sex groups.

Graphic Jump Location
Place holder to copy figure label and caption
Figure 2.

Prevalence of angiotensin II receptor blocker (A), angiotensin-converting enzyme inhibitor (B), cardioselective β-blocker (C), and calcium channel blocker (D) use from November 2004 to June 2007 by age and sex groups.

Graphic Jump Location

Tables

Table Graphic Jump LocationTable 1. Drug Classifications Included in the Analysis
Table Graphic Jump LocationTable 2. Select Demographic Characteristics Over Timea
Table Graphic Jump LocationTable 3. Treatment Prevalence as of April to June 2007 by Age, Sex, and Drug Classa

References

Ogden  CLCarroll  MDCurtin  LR McDowell  MATabak  CJFlegal  KM Prevalence of overweight and obesity in the United States, 1999-2004. JAMA 2006;295 (13) 1549- 1555
PubMed
Li  CFord  ESMokdad  AHCook  S Recent trends in waist circumference and waist-height ratio among US children and adolescents. Pediatrics 2006;118 (5) e1390- e1398
PubMed10.1542/peds.2006-1062
Weiss  RDziura  JBurget  TS  et al.  Obesity and the metabolic syndrome in children and adolescents. N Engl J Med 2004;350 (23) 2362- 2374
PubMed
Ogden  CLFlegal  KMCarroll  MDJohnson  CL Prevalence and trends in overweight among US children and adolescents, 1999-2000. JAMA 2002;288 (14) 1728- 1732
PubMed
Olshansky  SJPassaro  DJHershow  RC  et al.  A potential decline in life expectancy in the United States in the 21st century. N Engl J Med 2005;352 (11) 1138- 1145
PubMed
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