Table 3.

Positive pregnancy outcome associated with body mass index (kg/m²) by age groups, infertility type, and number of embryo transfer (ET).

Studied factor	Body mass index (BMI) kg/m2						P-interaction
	<25		25–<30		≥30
	OR	95% CI	OR	95% CI	OR	95% CI
Age groups
<27 years	1.00	—	0.30	0.10–0.85	0.23	0.05–1.00	0.46
27–33 years	1.00	—	1.02	0.50–1.95	0.95	0.30–2.45
>33 years	1.00	—	0.20	0.10–0.98	0.30	0.15–1.30
Type of infertility
Primary	1.00	—	0.27	0.15–0.98	0.35	0.12–0.99	0.76
Secondary	1.00	—	0.45	0.05–2.85	0.50	0.10–3.65
Number of ET∗
One ET	1.00	—	0.20	0.05–1.90	—	—	0.33
Two ET	1.00	—	0.50	0.12–2.56	0.45	0.10–2.89
Three and more ET	1.00	—	1.60	0.74–4.68	0.98	0.20–3.89

*Number of embryo transfer.