Table 1.

Inclusion and Exclusion Criteria for Included Studies

Aspect Considered	Inclusion Criteria	Exclusion Criteria
Setting	Primary health carea	Other settings
Population	Primary care population not depressed at baselineb	Primary care population depressed at baseline
Type of intervention	Psychological or educational interventionc	Pharmacological and physical interventions
Comparator	Care as usual, no intervention, waiting list, attention control, or placebo	Other controls
Design	RCT	Other designs
Outcome	Prevention of depression (incidence of depression or reduction of depressive symptoms)	Other outcomes
Language	All languages	No restrictions

RCT = randomized controlled trial.

^aAll patients included in the RCTs must be recruited in primary care, health centers, or general practices.

^bThe entire spectrum of nondepressed patients included ranges from nondepressive symptoms (0 symptoms) to subthreshold forms of depression (eg, minor depression or subsyndromal depression).

^cEducational interventions provide information about depression through lectures or fact sheets, whereas psychological interventions attempt to change how people think using a variety of different strategies (eg, cognitive behavioral or interpersonal therapy).