Nathalie S Saridjan1, Fleur P Velders1, Vincent W V Jaddoe2, Albert Hofman3, Frank C Verhulst4, Henning Tiemeier5. 1. The Generation R Study Group, Erasmus MC-University Medical Center, Rotterdam, The Netherlands; Department of Child and Adolescent Psychiatry, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands. 2. The Generation R Study Group, Erasmus MC-University Medical Center, Rotterdam, The Netherlands; Department of Epidemiology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands; Department of Pediatrics, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands. 3. Department of Epidemiology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands. 4. Department of Child and Adolescent Psychiatry, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands. 5. Department of Child and Adolescent Psychiatry, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands; Department of Epidemiology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands. Electronic address: h.tiemeier@erasmusmc.nl.
Abstract
BACKGROUND: Studies investigating the association between diurnal cortisol rhythm and behavioural problems in young children have yielded inconsistent results. We tested the hypothesis that variations in diurnal cortisol rhythm in pre-schoolers are already related to problem behaviour early in life with a cross-sectional and longitudinal design. METHODS: This study was embedded in Generation R, a population-based cohort from foetal life onwards. Parents collected saliva samples from their infant at 5 moments during 1 day. In 322 infants aged 12-20 months, we determined the diurnal cortisol rhythm by calculating the area under the curve (AUC), the cortisol awakening response (CAR), and the diurnal slope. Problem behaviour was assessed at ages 1.5 and 3 years with the Child Behavior Checklist/1.5-5 years. RESULTS: No cross-sectional associations between the cortisol composite measures and problem behaviour were found at 1.5 years. However, cortisol predicted change in internalizing problems as assessed from 1.5 to 3 years, but not change in externalizing problems. Children with higher AUC levels, flatter slopes and a more positive CAR at baseline were more likely to score higher on the Internalizing Problems scale (β per nmol/L AUC: 0.08, 95% CI: 0.00; 0.17, p=0.04; β per nmol/L/h slope: 0.57, 95% CI: 0.17; 0.98, p=0.006; β per nmol/L CAR: 0.04, 95% CI: 0.01; 0.08, p=0.02) at follow-up. CONCLUSIONS: Variations in diurnal cortisol rhythm are associated with change in internalizing problems in pre-schoolers. The results suggest that variations in diurnal cortisol patterns early in life precede internalizing problems.
BACKGROUND: Studies investigating the association between diurnal cortisol rhythm and behavioural problems in young children have yielded inconsistent results. We tested the hypothesis that variations in diurnal cortisol rhythm in pre-schoolers are already related to problem behaviour early in life with a cross-sectional and longitudinal design. METHODS: This study was embedded in Generation R, a population-based cohort from foetal life onwards. Parents collected saliva samples from their infant at 5 moments during 1 day. In 322 infants aged 12-20 months, we determined the diurnal cortisol rhythm by calculating the area under the curve (AUC), the cortisol awakening response (CAR), and the diurnal slope. Problem behaviour was assessed at ages 1.5 and 3 years with the Child Behavior Checklist/1.5-5 years. RESULTS: No cross-sectional associations between the cortisol composite measures and problem behaviour were found at 1.5 years. However, cortisol predicted change in internalizing problems as assessed from 1.5 to 3 years, but not change in externalizing problems. Children with higher AUC levels, flatter slopes and a more positive CAR at baseline were more likely to score higher on the Internalizing Problems scale (β per nmol/L AUC: 0.08, 95% CI: 0.00; 0.17, p=0.04; β per nmol/L/h slope: 0.57, 95% CI: 0.17; 0.98, p=0.006; β per nmol/L CAR: 0.04, 95% CI: 0.01; 0.08, p=0.02) at follow-up. CONCLUSIONS: Variations in diurnal cortisol rhythm are associated with change in internalizing problems in pre-schoolers. The results suggest that variations in diurnal cortisol patterns early in life precede internalizing problems.
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