Table 2 Characteristics of included studies
Criterion | Characteristic | No of studies (total n = 62) |
|---|---|---|
Year | Before 1990 | 1 |
1991–2000 | 3 | |
2001–2010 | 17 | |
After 2010 | 41 | |
Country | USA | 24 |
UK | 12 | |
Australia | 6 | |
Canada | 5 | |
The Netherlands | 3 | |
Finland | 2 | |
Other (single countries) | 10 | |
Setting | Primary school | 20 |
Secondary school | 29 | |
Both primary & secondary | 9 | |
Pupil referral units | 3 | |
Not stated | 1 | |
Study design | RCT | 25 |
Controlled trial | 11 | |
Qualitative | 11 | |
Cohort analytic | 8 | |
Mixed methods | 6 | |
Case control | 1 |