n (%) | |
Cross-sectional | 41 (36) |
Longitudinal (including cohort) | 17 (15) |
Intervention | 18 (16) |
Cross-sectional and longitudinal | 13 (11) |
Cross-sectional and intervention | 7 (6) |
Longitudinal and intervention | 2 (2) |
Cross-sectional, longitudinal and intervention | 2 (2) |
Not specified | 14 (12) |
Total | 114 |