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Subgroup analysis of effect sizes by feedback type.
| Feedback type | k | SMD (95% CI) | Weight, % | 95% CI | 95% CI | I2, 100% |
|---|---|---|---|---|---|---|
| Lower | Upper | |||||
| Basic feedback (Ref) | 7 | 0.456 | 26.9 | 0.242 | 0.67 | 89.30% |
| Guided feedback | 19 | 0.258 | 73.1 | −0.188 | 0.704 |
Test for subgroup differences (Between-group heterogeneity): χ2 = 2.43, df = 1, p = 0.119. k, number of studies; SMD, Standardized Mean Difference; CI, Confidence Interval; I2, measure of heterogeneity; Ref, Reference group.
