Other characteristics included in all models were: offspring sex, birth cohort (4 cohorts born 1982-86 (referent), 1987-89, 1990-93, 1994+), race/ethnicity (coded as white (referent)/black/other), case family status (i.e., ascertained through a proband in treatment) and overall household income in the family of origin based on mother's report at her interview (if no mother's report, father's report was used), classified into low (less than $29,999), middle ($30,000-74,999- referent) or high (≥ $75,000) categories.
