Chunk #41 — Methods — Trait Ascertainment

Source: Identification of 15 genetic loci associated with risk of major depression in individuals of European descent.
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In survey sources 1,3,4, and 5, we also asked for an age of first diagnosis of depression. This data was provided by a majority of participants, including 74% of cases in the discovery cohort and 85% of cases in the replication cohort.