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Summary table of the data from included studies showing the pooled prevalence of the causes of infertility using the random-effects model
| Causes of infertility | Number of studies | Pooled sample size | Pooled prevalence % (95% CI) | Heterogeneity (I2 %, p value) |
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| Female factors | 11 | 3822 | 41(34-48) | 94.4, p < 0.001 |
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| Male factors | 11 | 3822 | 27(22-33) | 92.6, p < 0.001 |
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| Combined factors | 8 | 2599 | 16(6-26) | 99.1, p < 0.001 |
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| Unexplained factors | 10 | 2848 | 17(10-24) | 96.8, p < 0.001 |
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CI, confidence interval
