Figure 1. Study groups for the primary study aim.

Flowchart of cases meeting inclusion and exclusion criteria for each group. *Psychiatric comorbidities included bipolar disorder, psychotic disorder, posttraumatic stress disorder, or neurocognitive disorder. A group of 74 people with a history of a unipolar depressive syndrome who were taking an SSRI but were asymptomatic on the BDI-II (score < 14) was also created (see supplemental material ^{(36.9KB, pdf)} ). BDI-II = Beck Depression Inventory-II, ROMHC = Royal Ottawa Mental Health Centre.