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Meta-regression analysis for the included studies to identify the source(s) of heterogeneity
| Covariate (source) | Coefficient | Standard error | t-value | p-value | 95% CI |
|---|---|---|---|---|---|
| Publication year | 0.014 | 0.295 | 0.05 | 0.962 | − 0.607, 0.635 |
| Sample size | − 0.001 | 0.010 | − 0.10 | 0.924 | −0.022, 0.020 |
