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Fig. 1 | Environmental Health and Preventive Medicine

Fig. 1

From: Prenatal exposure to bisphenol A and phthalates and behavioral problems in children at preschool age: the Hokkaido Study on Environment and Children’s Health

Fig. 1

Selection of study population. *The sub-cohort of 4869 participants, which corresponded to 23.3% of all participants (n = 20,926) in the Hokkaido study were established. In this sub-cohort, 500 participants who were randomly selected from each enrollment year between 2003 and 2011, and all 369 participants from the enrollment year 2012 were included. The sub-cohort population was supposed to be representing original cohort population. The aim of establishing the sub-cohort population was for effective exposure assessments

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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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