A birth cohort study to detect adverse health effects of environmental chemicals on the next generation and gene-environment interaction

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The prospective birth cohort with one obstetric hospital in Sapporo City has been conducted to investigate the association between child growth, neuro-development, and allergy, and low-level exposure to environmental chemicals during pregnancy, infancy and up to school age. A follow-up questionnaire was used at 18, 42, and 84 months of age to obtain relevant information including allergy prevalence, dietary habits, and smoking history of mother and the partner. The levels of PCDDs/PCDFs and PCBs in maternal blood and breast milk were measured using a high-resolution gas chromatography/high-resolution mass spectrometer (HRGC/HRMS). PFOS and PFOA levels in maternal blood were analyzed by liquid chromatography-tandem mass spectrometry (LC/MS/MS). We assessed the influence of low level intrauterine exposure of toxic chemicals on childhood neurodevelopment at 6, 18 and 42 months of age using the Bayley Scales of Infant Development second edition (BSID-II) and Japanese version of the Kaufman Assessment Battery for Children (K-ABC). The Japanese version of the Child Behavior Checklist (CBCL) was used to collect information on child behavior at age 43 months.