Comparison 27. E–Study‐related questionnaire + trial invitation vs trial invitation (GRADE: moderate).
Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
---|---|---|---|---|
1 Participants recruited | 1 | 2393 | Risk Difference (M‐H, Fixed, 95% CI) | 0.05 [0.02, 0.08] |