Table 3.
Threshold effect analysis of live birth using piece-wise linear regression.
| Threshold value project | Effect size(β) | 95%CI | P value |
|---|---|---|---|
| Female age(year) | |||
| ≤34 year(n=3102) | 1.0 | 1.0 to 1.1 | 0.059 |
| >34 year(n=3478) | 0.7 | 0.7 to 0.8 | <0.001 |
| BMI (Kg/M2) | |||
| ≤ 23.4 kg/m2(n=3999) | 0.9 | 0.9 to 1.0 | <0.001 |
| >23.4 kg/m2(n=2581) | 1.0 | 0.9 to 1.1 | 0.999 |
| AFC(n) | |||
| ≤ 8n(n=3738) | 1.4 | 1.3 to 1.4 | <0.001 |
| >8n(n=2842) | 1.0 | 1.0 to 1.1 | 0.017 |
Effect: live birth, Cause: Age BMI; AFC.
Adjusted: Primary infertility; Infertility years; Basal P; AMH (ng/mL); PRL (ng/L); No. of treatment cycles; Initiation dosage of Gn used; Duration of Gn used; Oocyte number; Controlled ovulation induction protocol. MI, body mass index; P, progesterone; AMH, anti-Müllerian hormone; AFC, antral follicle counting; PRL, prolactin; Gn, Gonadotropin.