Table 5.
Meta-regression results of the impact of selected study-level variables on the meta-analysis estimates
| Meta-analysis sub-group/predictor | No. trials/studies | Average estimate of effect (95 % CI) | Adjusted R 2a |
|---|---|---|---|
| RCT-behaviour-SMD | 10/10 | ||
| Dose (>1 vs. 1 exposure) | 0.68 (0.03, 1.33) | 44.6 % | |
| UBA-knowledge-RR | 22/20 | ||
| Document type (other vs. journal) | 2.01 (1.18, 3.43) | 19.3 % | |
| UBA-behaviour-RR | 20/17 | ||
| Target population engaged in intervention (yes vs. no) | 1.47 (1.02, 2.11) | 27.4 % |
RCT randomized controlled trials, UBA uncontrolled before-and-after studies, SMD standardized mean difference (Hedges’ g), RR relative risk, CI confidence interval
aAdjusted R 2 refers to the proportion of between-study variance accounted for by the model