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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