Table 1 Included studies with prespecified primary and secondary outcomes by study designs
Outcomes | Number of included studies | RCT | Cluster RCTs | Quasi-RCTs |
|---|---|---|---|---|
Primary outcomes | ||||
Contraceptive use during the last sex | 23 | 0 | 17 | 6 |
Unintended pregnancy | 3 | 0 | 3 | 0 |
Abortion | 3 | 0 | 3 | 0 |
Secondary outcome | ||||
Knowledge of contraception or contraceptive effectiveness | 25 | 1 | 20 | 4 |
Awareness of contraceptive methods | 1 | 0 | 1 | 0 |
Attitude toward contraception or a specific contraceptive method | 9 | 0 | 2 | 7 |