Table 2.

Binary logistic regression analysis of associations between covariates and adverse pregnancy outcomes.

Variable	OR (95%CI)	P
Elderly parturient		<0.001
No	1 (Ref)
Yes	1.32 (1.25-1.39)
Gravidity
1	1 (Ref)
2	1.06 (1.00-1.11)	0.035
≥3	1.23 (1.17-1.29)	<0.001
Parity
1	1 (Ref)
2	1.13 (1.08-1.18)	<0.001
≥3	1.24 (1.10-1.39)	<0.001
Assisted reproduction		<0.001
No	1 (Ref)
Yes	1.29 (1.12-1.47)
Gestational hypertension		<0.001
No	1 (Ref)
Yes	1.29 (1.12-1.49)
Gestational thyroid disorders		0.93
No	1 (Ref)
Yes	0.99 (0.90-1.10)
Delivery mode		<0.001
Eutocia	1 (Ref)
Cesarean	1.58 (1.51-1.65)
Infant sex		0.51
Male	1 (Ref)
Female	0.99 (0.95-1.03)

Bold represents P values less than 0.05.