Table 2.
Subgroup analysis of primary and secondary infertility by publication year
| Number of studies | Pooled proportion (95% CI) | Heterogeneity (I2 %, p value) | ||
|
| ||||
| Year of publication (PI) | Before 2005 | 4 | 44(15–73) | 99.6, p < 0.001 |
|
| ||||
| 2006–2015 | 7 | 71(63–79) | 93.4, p < 0.001 | |
|
| ||||
| 2016–2021 | 7 | 72(64–79) | 91.2, p < 0.001 | |
|
| ||||
| Year of publication (SI) | Before 2005 | 4 | 56(27–85) | 99.6, p < 0.001 |
|
| ||||
| 2006–2015 | 7 | 29(21–37) | 93.4, p < 0.001 | |
|
| ||||
| 2016–2021 | 7 | 28(21–36) | 91.2, p < 0.001 | |
|
| ||||
PI, primary infertility; SI, secondary infertility; CI, confidence interval