Paternal occupational exposure to chemicals and secondary sex ratio: results from the Japan Environment and Children's Study

BackgroundDeclining proportions of male births have been reported in several industrialised countries. Previous reports have shown that exposure to certain chemical substances might influence the secondary sex ratio (SSR). We assessed the associations between paternal occupational exposure to chemicals and the SSR of their children using the Japan Environment and Children's Study (JECS), a large-scale birth cohort study.MethodsData on paternal...