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Study contextual factors.
| Number of studies | % | |
|---|---|---|
| School characteristics | ||
| Reported geographical location | 9 | 18.8% |
| Reported school size | 5 | 10.4% |
| Participant characteristics | ||
| Reported participant socioeconomic characteristics | 12 | 25.0% |
| Reported participant ethnicity | 7 | 14.6% |
