Table 4 Number and percentage of included studies according to study design
| Study characteristics | Included studies (n = 130) |
|---|---|
| Study design | No. (%) |
| Cohort | 56 (43.1) |
| Cross-sectional | 52 (40.0) |
| Mixed methods | 8 (6.2) |
| Qualitative | 8 (6.2) |
| Case control | 3 (2.3) |
| Other | 3 (2.3) |