Nonpharmacological Treatment for Supporting Social Participation of Adults with Depression

Table 1

The level of evidence.

Level	Type of evidence
Level I	Systematic reviews, meta-analyses, randomized controlled trials
Level II	Two groups, nonrandomized studies (e.g., cohort, case-control)
Level III	One group, nonrandomized (e.g., before and after, pretest and posttests)
Level IV	Descriptive studies that include analysis of outcomes (single-subject design, case series)
Level V	Case reports and expert opinion that include narrative literature reviews and consensus statements

Adapted from Sackett’s evidence-based medicine [20, 21] and the Oxford Centre for Evidence-Based Medicine (OCEBM) [22].