Group

n

Age (year)

Gestational week (week)

First pregnancy (n,%)

History of cesarean section (n,%)

A

200

29.85 ± 5.63

7.8 ± 2.1

113 (56.50)

63 (31.50)

B

200

29.89 ± 5.37

8.1 ± 2.2

115 (57.50)

65 (32.50)

C

200

29.65 ± 5.71

7.9 ± 2.0

108 (54.00)

60 (30.0)

F (χ²)

1.501

1.912

0.608

0.309

P

0.107

0.010

0.750

0.830