| | Study omitted | Year | WMD | 95% CI | value | Heterogeneity |
| | Chen et al. | 2018 | -20.00 | -25.29, -14.70 | <0.001 | , | | Zhou et al. | 2017 | -19.76 | -24.80, -14.71 | <0.001 | , | | Zhai et al. | 2017 | -20.83 | -26.14, -15.51 | <0.001 | , | | Zhou et al. | 2017 | -18.80 | -23.01, -14.59 | <0.001 | , | | He et al. | 2016 | -21.30 | -26.40, -16.21 | <0.001 | , | | Yu et al. | 2015 | -20.80 | -26.00, -15.59 | <0.001 | , | | Yu et al. | 2014 | -20.74 | -25.92, -15.52 | <0.001 | , | | Chen et al. | 2009 | -20.32 | -25.45, -15.19 | <0.001 | , | | Genade et al. | 2008 | -20.75 | -26.40, -15.10 | <0.001 | , | | Lochner et al. | 2006 | -19.61 | -24.65, -14.58 | <0.001 | , | | Sahna et al. | 2005 | -20.85 | -26.08, -15.62 | <0.001 | , | | Sahna et al. | 2002 | -21.21 | -26.32, -16.10 | <0.001 | , | | Lee et al. | 2002 | -19.70 | -24.48, -14.56 | <0.001 | , | | Lagneux et al. | 2000 | -21.32 | -26.42, -16.23 | <0.001 | , | | Nduhirabandi et al. | 2010 | -20.72 | -26.29, -15.14 | <0.001 | , | | Overall | -20.45 | -25.43, -15.47 | <0.001 | <0.001 |
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