Table A3.

Adjusted OR and AUC with 95 % CI in the Predictive Model for Influencing Factors of PPH among Pregnant Nulliparous Women in Hunan, China, during 2017–2018 (n = 60686).

Variable	Multivariate logistic regression analysis			Single factor analysis in predictive model
	AOR	95 % CIs	P-value	AUC	95 % CIs	P-value
Number of ANC				0.501	0.472–––0.504	0.136
0–3 ANC visits	2.90	1.65–––5.08	≤0.001
4–9 ANC visits	0.86	0.76–––0.99	0.065
≥ 10 ANC visits (Ref.)		Ref.
Mode of Childbirth				0.567	0.552–––0.583	≤0.001
Normal vaginal birth/SVD(Ref.)		Ref.
Cesarean section	5.02	4.03–––6.26	≤0.001
Instrumental/Assisted	1.49	0.82–––2.73	0.149
Gestational age (in weeks)				0.508	0.492–––0.524	0.328
Term (37–41 weeks) (Ref.)		Ref.
Preterm (<37 weeks)	1.42	0.99–––2.02	0.104
Post-term (≥42 weeks)	0.28	0.08–––0 0.95	0.046
Birth weight				0.503	0.466–––0.507	0.039
Normal birth weight (2500-3999 g) (Ref.)		Ref.
Low birth weight (<2500 g)	2.08	1.39–––3.11	≤0.001
Large birth weight (≥4000 g)	0.34	0.28–––0.43	≤0.001
Anemia				0.751	0.737–––0.765	≤0.001
Yes	8.41	7.34–––9.64	≤0.001
No (Ref.)		Ref.
Placenta abruption				0.503	0.487–––0.519	0.689
Yes	2.93	1.46–––5.84	≤0.002
No (Ref.)		Ref.
Soft birth canal avulsion				0.529	0.512–––0.546	≤0.001
Yes	4.01	3.11–––5.16	≤0.001
No (Ref.)		Ref.
Thrombophlebitis				0.501	0.485–––0.517	0.926
Yes	18.46	(1.67–––20.31)	0.011
No (Ref.)		Ref.
Hysterectomy				0.509	0.493–––0.525	0.277
Yes	2.50	1.67–––3.75	≤0.001
No (Ref.)		Ref.
General anesthesia used before birth				0.500	0.453–––0.505	≤0.001
Yes	1.42	1.19–––1.69	≤0.001
No (Ref.)		Ref.
Erythrocyte suspension transfusion before birth				0.604	0.576–––0.612	≤0.001
Yes	48.67	36.43–––65.04	≤0.001
No (Ref.)		Ref.

ANC: Antenatal Care, OR: Odd ratio, AUC: Area under the curve, CI: Confidence Interval, SVD: Spontaneous Vaginal Delivery, Ref: Reference category, PPH: Postpartum hemorrhage.