Table 2.
Multivariable logistic regression analysis with SSR in singletons
| Variables | OR | 95% CI |
|---|---|---|
| Infertility type | ||
| Primary | 1.000 | – |
| Secondary | 1.164 | 1.009–1.342 |
| Infertility factor | ||
| Female | 1.000 | – |
| Male | 1.031 | 0.800–1.330 |
| Both male and female | 0.896 | 0.739–1.087 |
| Paternal age group (year) | ||
| ≤30 | 1.000 | – |
| 31–33 | 1.143 | 0.951–1.372 |
| 34–36 | 1.048 | 0.865–1.271 |
| ≥37 | 1.261 | 1.038–1.534 |
| Fertilization method | ||
| IVF | 1.000 | – |
| ICSI | 0.996 | 0.772–1.285 |
| FET | 0.738 | 0.597–0.912 |
| Embryo transfer stage | ||
| Cleavage stage | 1.000 | – |
| Blastocyst | 1.339 | 1.030–1.742 |
| Days of Gn use (day) | 0.961 | 0.932–0.990 |
Male singletons selected as the reference category
SSR Secondary sex ratio, IVF In vitro fertilization, ICSI Intracytoplasmic sperm injection, FET Frozen embryo transfer, Gn Gonadotropin