CONTEXT: Because of methodological limitations, the results of the few prospective studies assessing long-term cognitive effects of prenatal cocaine exposure are inconsistent. OBJECTIVE: To assess effects of prenatal cocaine exposure and quality of caregiving environment on 4-year cognitive outcomes. DESIGN: Longitudinal, prospective, masked comparison cohort study from birth (September 1994-June 1996) to 4 years. SETTING: Research laboratory of a US urban county teaching hospital. PARTICIPANTS: A total of 415 consecutively enrolled infants identified from a high-risk population screened for drug use through clinical interview, urine, and meconium screens. Ninety-three percent retention for surviving participants at 4 years of age resulted in 376 children (190 cocaine-exposed and 186 nonexposed). MAIN OUTCOME MEASURE: The Wechsler Preschool and Primary Scales of Intelligence-Revised. RESULTS: After control for covariates, prenatal cocaine exposure was not related to lower full-scale IQ (cocaine exposed [80.7] vs nonexposed [82.9]; P =.09) scores or summary verbal (cocaine exposed [79.9] vs nonexposed [81.9]; P =.11) or performance (cocaine exposed [85.5] vs nonexposed [87.5]; P =.18) IQ scores at age 4 years. However, prenatal cocaine exposure was related to small but significant deficits on several subscales (mean [SE]): visual-spatial skills (cocaine exposed [7.3 (0.22)] vs nonexposed [8.2 (0.22)]; P =.01), general knowledge (cocaine exposed [6.1 (0.18)] vs nonexposed [6.7 (0.17)]; P =.04), and arithmetic skills (cocaine exposed [6.2 (0.20)] vs nonexposed [6.8 (0.20)]; P =.05). Prenatal cocaine exposure was also associated with a lower likelihood of achievement of IQ above normative means (odds ratio, 0.26 [95% confidence interval, 0.10-0.65]; P =.004). The quality of the caregiving environment was the strongest independent predictor of outcomes. Cocaine-exposed children placed in nonrelative foster or adoptive care lived in homes with more stimulating environments and had caregivers with better vocabulary scores, and they attained full-scale and performance IQ scores (83 and 87, respectively) similar to nonexposed children in biological maternal or relative care (full-scale IQ, 82; performance IQ, 88) and higher than cocaine-exposed children in biological maternal or relative care (full-scale IQ, 79; performance IQ, 84). CONCLUSIONS: Prenatal cocaine exposure was not associated with lower full-scale, verbal, or performance IQ scores but was associated with an increased risk for specific cognitive impairments and lower likelihood of IQ above the normative mean at 4 years. A better home environment was associated with IQ scores for cocaine-exposed children that are similar to scores in nonexposed children.
CONTEXT: Because of methodological limitations, the results of the few prospective studies assessing long-term cognitive effects of prenatal cocaine exposure are inconsistent. OBJECTIVE: To assess effects of prenatal cocaine exposure and quality of caregiving environment on 4-year cognitive outcomes. DESIGN: Longitudinal, prospective, masked comparison cohort study from birth (September 1994-June 1996) to 4 years. SETTING: Research laboratory of a US urban county teaching hospital. PARTICIPANTS: A total of 415 consecutively enrolled infants identified from a high-risk population screened for drug use through clinical interview, urine, and meconium screens. Ninety-three percent retention for surviving participants at 4 years of age resulted in 376 children (190 cocaine-exposed and 186 nonexposed). MAIN OUTCOME MEASURE: The Wechsler Preschool and Primary Scales of Intelligence-Revised. RESULTS: After control for covariates, prenatal cocaine exposure was not related to lower full-scale IQ (cocaine exposed [80.7] vs nonexposed [82.9]; P =.09) scores or summary verbal (cocaine exposed [79.9] vs nonexposed [81.9]; P =.11) or performance (cocaine exposed [85.5] vs nonexposed [87.5]; P =.18) IQ scores at age 4 years. However, prenatal cocaine exposure was related to small but significant deficits on several subscales (mean [SE]): visual-spatial skills (cocaine exposed [7.3 (0.22)] vs nonexposed [8.2 (0.22)]; P =.01), general knowledge (cocaine exposed [6.1 (0.18)] vs nonexposed [6.7 (0.17)]; P =.04), and arithmetic skills (cocaine exposed [6.2 (0.20)] vs nonexposed [6.8 (0.20)]; P =.05). Prenatal cocaine exposure was also associated with a lower likelihood of achievement of IQ above normative means (odds ratio, 0.26 [95% confidence interval, 0.10-0.65]; P =.004). The quality of the caregiving environment was the strongest independent predictor of outcomes. Cocaine-exposed children placed in nonrelative foster or adoptive care lived in homes with more stimulating environments and had caregivers with better vocabulary scores, and they attained full-scale and performance IQ scores (83 and 87, respectively) similar to nonexposed children in biological maternal or relative care (full-scale IQ, 82; performance IQ, 88) and higher than cocaine-exposed children in biological maternal or relative care (full-scale IQ, 79; performance IQ, 84). CONCLUSIONS: Prenatal cocaine exposure was not associated with lower full-scale, verbal, or performance IQ scores but was associated with an increased risk for specific cognitive impairments and lower likelihood of IQ above the normative mean at 4 years. A better home environment was associated with IQ scores for cocaine-exposed children that are similar to scores in nonexposed children.
Authors: Diana L Dow-Edwards; Helene Benveniste; Marylou Behnke; Emmalee S Bandstra; Lynn T Singer; Yasmin L Hurd; L R Stanford Journal: Neurotoxicol Teratol Date: 2006 May-Jun Impact factor: 3.763
Authors: Christy L White; Paul J Pistell; Megan N Purpera; Sunita Gupta; Sun-Ok Fernandez-Kim; Taylor L Hise; Jeffrey N Keller; Donald K Ingram; Christopher D Morrison; Annadora J Bruce-Keller Journal: Neurobiol Dis Date: 2009-04-15 Impact factor: 5.996
Authors: Lynn T Singer; Laurie J Eisengart; Sonia Minnes; Julia Noland; Arthur Jey; Courtney Lane; Meeyoung O Min Journal: Infant Behav Dev Date: 2005-12