Table 3.
Threshold effects of endometrial thickness on gestational age and the incidence of preterm delivery using piece-wise linear regression.
| Characteristics | Crude β/OR | P-value | Adjust β/OR | P-value |
|---|---|---|---|---|
| (95% CI) | (95% CI) | |||
| Gestational age (weeks) | ||||
| ≤7.8 mm | 1.56 (1.04, 1.97) | 0.0027 | 1.94 (1.26, 2.63) | <0.0001* |
| >7.8 mm | 0.11 (0.01, 0.21) | 0.0332 | 0.10 (−0.01, 0.20) | 0.0640 |
| Incidence of preterm delivery | ||||
| ≤7.6 mm | 0.63 (0.01, 0.99) | 0.0302 | 0.47 (0.03, 0.99) | 0.0107* |
| >7.6 mm | 0.85 (0.15, 3.37) | 0.2871 | 0.68 (0.32, 1.29) | 0.1589 |
Analyses were adjusted for maternal age, paternal age, maternal BMI, basal FSH, anti-Müllerian hormone (AMH), type of infertility, prior gonadotropin cycle, ovarian stimulation protocols, dosage of gonadotropins, estrogen (E2) level on the hCG trigger day, number of oocytes retrieved, fertilization method, number and stage of embryos transferred, and gender of newborn.
OR, odds ratio; CI, confidence interval.
*
Statistically significant, with P < 0.05.