Table A2.

Adjusted OR and AUC with 95 % CI in the Predictive Model for Influencing Factors of PPH among Pregnant Nulliparous and Multiparous Women in Hunan, China, during 2017–2018 (n = 144,845).

Variable	Multivariate logistic regression analysis			Single factor analysis in predictive model
	AOR	95 % CIs	P-value	AUC	95 % CIs	P-value
Number of ANC				0.502	0.481–––0.503	0.150
0–3 ANC visits	2.15	1.63–––2.83	≤0.001
4–9 ANC visits	0.85	0.77–––0.93	≤0.001
≥ 10 ANC visits (Ref.)		Ref.
Mode of Childbirth				0.571	0.561–––0.581	≤0.001
Normal vaginal birth/SVD(Ref.)		Ref.
Cesarean section	7.82	6.86–––8.91	≤0.001
Instrumental/Assisted	1.87	1.26–––2.77	0.002
Gestational age (in weeks)				0.501	0.490–––0.512	0.886
Term (37–41 weeks) (Ref.)		Ref.
Preterm (<37 weeks)	1.41	1.12–––1.76	0.003
Post-term (≥42 weeks)	0.47	0.18–––1.20	0.110
Birth weight				0.500	0.462–––0.505	≤0.001
Normal birth weight (2500-3999 g) (Ref.)		Ref.
Low birth weight (<2500 g)	1.48	1.14–––1.92	0.003
Large birth weight (≥4000 g)	0.41	0.36––0.47	≤0.001
Anemia				0.741	0.731–––0.750	≤0.001
Yes	7.02	6.39–––7.70	≤0.001
No (Ref.)		Ref.
Gestational hypertension				0.504	0.493–––0.515	0.425
Yes	1.49	1.16––1.91	0.002
No (Ref.)		Ref.
Placenta abruption				0.507	0.496–––0.519	0.181
Yes	3.02	2.04–––4.47	≤0.001
No (Ref.)		Ref.
Soft birth canal avulsion				0.523	0.512–––0.535	≤0.001
Yes	4.15	3.45–––4.99	≤0.001
No (Ref.)		Ref.
Thrombophlebitis				0.501	0.490–––0.511	0.926
Yes	11.96	1.81–––78.95	0.010
No (Ref.)		Ref.
Hysterectomy				0.508	0.497–––5.19	0.165
Yes	2.87	2.16–––3.81	≤0.001
No (Ref.)		Ref.
General anesthesia used before birth				0.511	0.500––0.522	0.050
Yes	2.87	2.56–––3.22	≤0.001
No (Ref.)		Ref.
Erythrocyte suspension transfusion before birth				0.604	0.592–––0.617	≤0.001
Yes	54.06	46.25–––63.19	≤0.001
No (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.