Risk factors

Effective

% Total risk pregnancies (n = 524)

% Total risk factors (n = 1667)

Age > 35 years

75

14.3%

4.5%

Parity > 4

40

7.6%

2.4%

Abortion history repeating

98

18.7%

5.9%

History of uterine malformation

1

0, 2%

0.1%

Multiple pregnancy

143

27.3%

8.6%

Maternal infection history

309

59.0%

18.5%

History of fetal or neonatal death unexplained

206

39.3%

12.4%

Previous Caesarean section

227

43.3%

13.6%

History of low birth weight

161

30.7%

9.7%

History of macrosomia

8

1.5%

0.5%

Antepartum haemorrhage

153

29.2%

9.2%

Premature rupture of membranes

98

18.7%

5.9%

Excessive HU

180

34.4%

10.8%

HU decreased

35

6.7%

2.1%

History of prematurity

126

24.0%

7.6%

Anemia

93

17.7%

5.6%