| Study | Sample size |
Proportion (%) |
95% CI | Weight (%) |
Test for heterogeneity | |
| Random | Q | 59.3637 | ||||
| Nicoloff et al 1998 | 112 | 87.500 | 79.917 to 92.995 | 49.58 | DF | 1 |
| Chung et al 2006 | 334 | 50.000 | 44.509 to 55.491 | 50.42 | Significance level | P < 0.0001 |
| Total (fixed effects) | 446 | 60.492 | 55.797 to 65.048 | 100.00 | I2 (inconsistency) | 98.32% |
| Total (random effects) | 446 | 70.187 | 30.262 to 97.240 | 100.00 | 95% CI for I2 | 96.22 to 99.25 |
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