Table 6. Heterogeneity measure.
| Measure | Estimate | Lower bound | Upper bound |
| tau^2 | 0.0495 | 0 | 48.0704 |
| tau | 0.2224 | 0 | 6.9333 |
| I^2(%) | 22.4095 | 0 | 99.6449 |
| H^2 | 1.2888 | 1 | 281.598 |
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