Population subgroups of interest include age group (young and middle‐aged adults: 18–60 years; older adults: 60 years and above), gender and sexual orientation (female, male, and LGBT community), career (e.g., nurse, doctor, student, teacher, police), and health state (depression alone, depression with physical disease, and depression with other psychical disorders).
The number of interventions: single treatment and combination treatment.
Type of depression: disruptive mood dysregulation disorder, major depressive disorder, persistent depressive disorder (dysthymia), premenstrual dysphoric disorder, substance or medication‐included depressive disorder, depressive disorder due to another medical condition, bipolar depression, other specific depressive symptoms, unspecified depressive disorder.
The severity of depression: mild depressive symptoms, moderate depressive symptoms, moderate to severe depressive symptoms, severe depressive symptoms, major depressive symptoms, other specific depressive symptoms, and undefined.
Period of depression: lifetime, 12 months, 6 months, 1 month, and not stated.
Number of episodes: depression episode, depression recurrence, and not stated;
The implementer of treatment: self‐help, healthcare provided, and provided by mental health professionals or volunteers.
Effectiveness of interventions: We will record whether the systematic review reported a mean positive statistically significant effect, a mean statistically significant negative effect, or no statistically significant difference between treatment and comparison conditions.
Region: Africa, Americas, East Asia, Europe, Eastern Mediterranean, Western Pacific.
Countries: any noted.
Conflict of interest: yes, no, and unclear.
Quality of studies: high, moderate, low, and critically low.
