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Table 4 Maternal characteristics and intrapartum factors according to BMI WHO classification in the whole study population

From: Impact of obesity and other risk factors on labor dystocia in term primiparous women: a case control study

BMI

< 18.5 (22)

≥18.5–25 (379)

≥25–30 (113)

≥30–35 (45)

≥35 (31)

p-value

Maternal age (y, mean)

24.5

27.9

28.6

28.8

28.9

0.007

Diabetes (GDM or DM) (%)

0

7.1

18.6

24.4

51.6

< 0.001

Chronic disease (%)

27.3

27.4

27.4

35.6

41.9

0.396

Thyroid disorder (%)

0

4

7.1

2.2

16.1

0.039

Gestational age (d, median)

281

283

285

289

286

a

Infertility treatment %

5

8.1

12.8

9.3

14.3

0.264

Admission dilatation (mean, cm)

2.8

2.2

1.9

1.8

1.4

0.007

Head position in birth canal at admission (mean, cm)

−1.9

−2.2

−2.6

−2.6

−2.8

< 0.001

Spontaneous contractions (%)

77.3

56.4

38.1

33.3

32.3

< 0.001

Induction of labor (%)

9.1

17.4

29.2

31.1

45.2

< 0.001

Duration of labor in VD excl. CS (h:min, median)

8:50

10:20

10:31

10:39

14:35

0.51

Oxytocin during labor (%)

68.2

81.5

89.4

93.3

87.1

0.024

Chorionamnionitis (%)

4.5

15.3

19.5

20.0

35.5

0.002

Fetal malposition (%)

13.6

23.8

31.9

28.9

38.7

0.113b

Use of IUPC (%)

18.2

29.1

42.5

57.8

61.3

< 0.001

PROM (%)

13.6

27.2

30.0

29.5

41.9

0.23c

Time between ROM and delivery (h:min)

4:05

8:02

8:50

8:47

11:40

d

CTG pathology

9.1

23.0

24.8

22.2

22.6

0.878

Birth weight (g, mean)

3245

3518

3667

3816

3718

< 0.001

 LGA > 4500 g (%)

0

2.1

2.7

11.1

3.2

 

 SGA < 2500 g (%)

4.5

1.1

0

0

0

 

5 min Apgar

8.86

8.85

8.90

8.93

8.39

0.307

Umb. artery pH

7.28

7.28

7.30

7.31

7.28

NS

  1. ap-value was significant (< 0.05) when normal BMI (18.5–25) was compared to BMI group ≥ 25–30 or ≥ 30–35
  2. bSignificant trend (p = 0.014)
  3. cSignificant trend (p = 0.046)
  4. dp-values between BMI groups < 18.5– ≥35 p = 0.001 and ≥ 18.5–25 p = 0.023