- Minimally adjusted models were adjusted for child age at assessment, child sex, study site, and urinary specific gravity. Fully adjusted models were additionally adjusted additionally adjusted for the interaction between SG and cohort, maternal age, education at enrollment, race, and ethnicity; season of birth; inflation-adjusted household income interacted with household size, neighborhood deprivation index, prenatal ETS exposure, postnatal ETS exposure, maternal history of asthma, and firstborn status