Table 3.
The heterogeneity of the included studies through sensitivity analysis.
| Excluded studies | SMD (95% CI) | I 2 | P value |
| Herrmann et al (2005) | 1.214 (0.755, 1.674) | 97.0 | <.001 |
| Gibelin et al (2006) | 1.180 (0.702, 1.659) | 96.8% | <.001 |
| Raeder et al (2006) | 0.872 (0.512,1.231) | 95.1% | <.001 |
| May et al (2007) | 1.253 (0.763,1.743) | 95.5% | <.001 |
| Okuyan et al (2010) | 1.121 (0.672, 1.571) | 96.8% | <.001 |
| Topcuoglu et al (2010) | 1.181 (0.722, 1.640) | 96.9% | <.001 |
| Agoston-Coldea et al (2011) | 1.201 (0.731, 1.671) | 96.9% | <.001 |
| Makarewicz-Wujec and Kozlowska-Wojciechowska (2011) | 1.170 (0.709, 1.1.632) | 96.9% | <.001 |
| Hjelm et al (2014) | 1.231 (0.716, 1.746) | 96.9% | <.001 |
| Fournier et al (2015) | 1.183 (0.715, 1.651) | 96.9% | <.001 |
| Strauss et al (2017) | 1.219 (0.741, 1.697) | 97.0% | <.001 |
| El-Amrousy et al (2018) | 0.970 (0.596, 1.344) | 95.3% | <.001 |
CIs = confidence intervals, SMDs = standardized mean differences.