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Table 2 Summary of meta-analysis results and subgroups analysis

From: Tubal ligation and endometrial Cancer risk: a global systematic review and meta-analysis

Groups Test of association Heterogeneity
OR(95% CI) P value Model Z Chi square P value I square
study design
 Cohort 0.72(0.51–1.00) 0.053 Random 1.94 67.04 0.001 95.5%
 Case control 0.47(0.18–1.21) 0.116 Random 1.57 68.32 0.001 95.6%
Date of publication
 1996–2007 0.71(0.57–0.87) 0.001 Fixed 3.22 5.86 0.119 48.8%
 2008–2018 0.48(0.31–0.80) 0.001 Random 3.24 145.62 0.001 97.9%
Sample size
 Less than 10,000 0.44(0.18–1.07) 0.075 Random 1.78 65.91 0.001 97.0%
 More than 10,000 0.73(0.52–1.03) 0.071 Random 1.81 68.70 0.001 94.2%
Study quality
 High 0.71(0.54–0.92) 0.011 Random 2.54 72.00 0.001 93.1%
 Moderate 0.31(0.03–3.34) 0.333 Random 0.97 58.49 0.001 98.3%
Overall 0.58(0.42–0.80) 0.001 Random 3.40 152.30 0.001 95.4%
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