Different questionnaires were used to collect sociodemographic and behavior data on the two subsets of participants recruited at EPA and NIEHS. While basic sociodemographic data, such as age, gender, race, and ethnicity were collected consistently, some questions on relevant social and behavioral factors were formulated differently. The current analysis utilized only those questionnaire data that were collected consistently and could be combined into a pooled dataset. Data on education, occupation and income, as well as residential addresses, were not available for the subset of individuals recruited at NIEHS.

Body mass index (BMI) values were estimated using weight and height measurements performed in both subsets by health professionals.

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