Table 1 Baseline characteristics in subjects according to application of PBO

Maternal Age (years )

33.58 ± 4.05

34.37 ± 4.42

0.498

BMI (kg/m²)

25.67 ± 2.94

26.80 ± 3.34

0.561

Gestational weeks (weeks)

36.4 ± 1.63

36.34 ± 2.22

0.079

Gravidity (number)

4 (3–4)

4 (3–4)

0.605

Parity (number)

2 (2–3)

2 (2–2)

0.005

Abortion(number)

1 (0–2)

1 (1–2)

0.254

Prior CS (number)

1 (1–1)

1 (0–1)

0.001

Type of CS

Planed CS

50 (87.7%)

156 (68.4%)

0.004

Emergency CS

7(12.3%)

72 (31.6%)

Type of PAS

< 0.001

Placenta Accreta

2 (3.5%)

89 (39.0%)

Placenta Increta

23 (40.4%)

114 (50.0%)

Placenta Percreta

32 (56.1%)

25 (11.0%)

MRI invasion topography

N = 52

N = 210

MRI with S1 invasion

15 (28.8%)

150 (71.4%)

< 0.001

MRI with S2 invasion

37 (71.2%)

60 (28.6%)

< 0.001