RT Journal A1 Bernard K, Butzin-Dozier Z, Rittenhouse J, Dozier M T1 COrtisol production patterns in young children living with birth parents vs children placed in foster care following involvement of child protective services JF Archives of Pediatrics & Adolescent Medicine JO Archives of Pediatrics & Adolescent Medicine YR 2010 FD May 1 VO 164 IS 5 SP 438 OP 443 DO 10.1001/archpediatrics.2010.54 UL http://dx.doi.org/10.1001/archpediatrics.2010.54 AB Objective  To examine differences in waking to bedtime cortisol production between children who remained with birth parents vs children placed in foster care following involvement of Child Protective Services (CPS).Design  Between-subject comparison of cortisol patterns among 2 groups of children.Setting  Children referred from the child welfare system.Participants  Three hundred thirty-nine children aged 2.9 to 31.4 months who were living with birth parents (n = 155) or placed in foster care (n = 184) following CPS involvement as well as 96 unmatched children from low-risk environments.Main Exposures  Involvement by CPS and foster care.Main Outcome Measure  Salivary cortisol samples obtained at waking and bedtime for children on 2 days.Results  Child Protective Services–involved children who continued to live with birth parents and CPS-involved children placed in foster care differed in cortisol production, with children living with their birth parents showing flatter slopes in waking to bedtime values.Conclusions  Continuing to live with birth parents following involvement of CPS is associated with greater perturbation to the diurnal pattern of cortisol production than living with foster parents. Foster care may have a regulating influence on children's cortisol among children who have experienced maltreatment.