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Subgroup analysis of effect sizes by subject domain.
| Subject domain | k | SMD (95% CI) | Weight, % | 95% CI | 95% CI | I2, 100% |
|---|---|---|---|---|---|---|
| Lower | Upper | |||||
| Language (Ref) | 4 | 0.046 | 15.4 | −0.25 | 0.341 | 85.30% |
| Mathematics | 20 | 0.277 | 76.9 | 0.114 | 0.44 | |
| Other | 2 | 1.021 | 7.7 | 0.264 | 1.778 |
Test for subgroup differences (Between-group heterogeneity): χ2 = 17.68, df = 2, p < 0.001. k, number of studies; SMD, Standardized Mean Difference; CI, Confidence Interval; I2, measure of heterogeneity; Ref, Reference group.
