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Statistical evaluation of the results of meta-analysis. The test of null was performed for both the fixed and random models and was significant. The heterogeneity and Tau-squared tests applied to the fixed model are also shown.
| Model | Test of null (2-tail) | Heterogeneity | Tau-squared | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Z value | P value | Q value | df (Q) | P value | I-squared | Tau-squared | SE | Variance | Tau | |
| Fixed | −8.841 | 0.000 | 75.243 | 19 | 0.000 | 74.748 | 1.015 | 0.603 | 0.364 | 1.008 |
