Chunk #21 — 2. METHODS — 2.3. Measures — 2.3.8. Demographics

Source: Parent, sibling and peer associations with subtypes of psychiatric and substance use disorder comorbidity in offspring.
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Offspring gender, age, and ethnicity were based on self-report. Paternal education, marital status, and yearly household income were based on father’s report during the 2002–2003 interviews. Maternal educational level was based on mother’s report.