Japan Children’s Study conducted by the Research Institute of Science and Technology for Society, and the National Study on Children’s Environment and Health planned by the Ministry of Environment. These studies were planned with specific goals, and these goals and their study subjects are similar to the hypotheses of the National Children’s Study. However, the United States combines different hypotheses in one national research project, and as such, there is a difference in national strategy between Japan and the United States. If we consider the difficulty of carrying out a cohort study and correlating diverse factors concerning child health and.
