Table 3.
Multivariate logistic regression model of sex ratio among singleton births following single blastocyst frozen embryo transfer (FET) cycles in relation to blastocyst quality and morphology
| Variable | aOR(95% CI) | P value |
|---|---|---|
| Good | 1.57 (1.24 ~ 2) | < 0.001 |
| Poor | Reference | |
| Expansion degree | ||
| 4 | Reference | |
| 5 | 0.96 (0.61 ~ 1.49) | 0.843 |
| 6 | 1.63 (0.89 ~ 2.99) | 0.111 |
| Inner cell mass | ||
| A | 0.71 (0.49 ~ 1.01) | 0.059 |
| B | Reference | |
| Trophectoderm | ||
| A | 1.4 (0.91 ~ 2.16) | 0.128 |
| B | 1.71 (1.33 ~ 2.21) | < 0.001 |
| C | Reference | |
Note: Sex ratio adjusted for age, BMI, type of fertilization, day of embryo transfer. P < 0.05 was considered statistically significant. BMI = body mass index; CI = confidence interval