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Baseline 3-day averages of raw salivary cortisol level (µg/dl) across the day for never-depressed participants, participants who experienced a first onset of major depressive episode (MDE) within the 4-year follow-up, participants who experienced a recurrence of MDE within the 4-year follow-up, and participants with a history of MDE but no recurrence during the 4-year follow-up. Analyses were conducted with natural logarithmically transformed values.
