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The statistical methods used in this meta-analysis.
| Statistic means | Goals and usages |
|---|---|
| Labbe plot | To evaluate heterogeneity between the included studies |
| Cochran Q test | To evaluate heterogeneity between the included studies |
| I2 index test | To evaluate heterogeneity between the included studies |
| Sensitivity analysis | To examine the stability of the pooled results |
| Contour-enhanced funnel plot | Publication bias test |
