Table 2.

The association between twin gestation and placenta accreta

Variables	Model 1*	P-value	Model 2†	P-value	Model 3‡	P-value	Model 4§	P-value
Placenta accreta	1.79 (1.51, 2.12)	<0.001¶	1.87 (1.57, 2.23)	<0.001¶	1.81 (1.51, 2.18)	<0.001¶	1.51 (1.24, 1.83)	<0.001¶
Placenta accreta with bleeding	2.76 (1.97, 3.86)	<0.001¶	2.80 (1.98, 3.96)	<0.001¶	2.88 (2.01, 4.15)	<0.001¶	2.33 (1.57, 3.45)	<0.001¶

ART – assisted reproductive technology, GDM – gestational diabetes mellitus, FGR – foetal growth restriction, ICP – intrahepatic cholestasis of pregnancy, PBMI – pre-pregnancy body mass index, PE – preeclampsia

*Model 1: unadjusted, univariate analysis.

†Model 2: adjusted for maternal age, PBMI, nulliparity, primigravida, history of caesarean section, history of alcoholism.

‡Model 3: adjusted for racquet placenta, velaria placenta, placenta previa, GDM, PE, ICP, FGR plus variables adjusted in Model 2.

§Model 4: adjusted for ART plus variables adjusted in Model 3.

¶P < 0.05.