Table 2 Risk factors associated with uPAS

History of intrauterine adhesions

3.68(1.43–9.49)

7.93(2.35–26.81)

History of clinical confirmed PAS

3.85(1.92–7.74)

6.99(2.85–17.18)

Placenta location

 Anterior(ref)

NA

NA

 Posterior

5.84(3.52–9.68)

6.30(3.48–11.40)

 bilateral/fundal

2.01(0.80–5.03)

2.64(0.90–7.69) ^c

History of placenta previa

1.91(0.80–4.54)

3.41(1.18–9.82)

Gravidity > 3

0.46(0.29–0.72)

0.40(0.22–0.74)

History of previous CD

0.31(0.18–0.52)

0.36(0.19–0.70)

Placenta previa

0.19(0.10–0.36)

0.19(0.09–0.40)