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Table 2 Attempted assisted vaginal delivery in relation to pre-pregnancy body weight and participant characteristics among laboring women in need of operative delivery assistance (N = 2282). Percentage represents the total number for each category in the final study group

From: Effects of maternal obesity on the success of assisted vaginal delivery in Chinese women

Characteristics

Attempted vacuum

Attempted Forceps

N (%)

Crude OR [95% CI]

Adjusted OR [95% CI]

N (%)

Crude OR [95% CI]

Adjusted OR [95% CI]

Pre-pregnancy BMI (kg/m2)

 Normal Weight (18.5 to < 23.0)

777 (37.7)

Reference

Reference

623 (30.2)

Reference

Reference

 Overweight (23.0–27.5)

145 (40.2)

0.87 [0.72–0.99]

0.88 [0.69–0.98]

131 (36.3)

0.79 [0.69–0.99]

0.76 [0.68–0.98]

 Obese (≥27.5)

304 (48.3)

0.43 [0.36–0.67]*

0.42 [0.32–0.72]*

302 (48.1)

0.38 [0.31–0.59]*

0.34 [0.29–0.52]*

Age (years)

 < 20 years

88 (39.6)

1.08 [1.02–1.14]

1.15 [1.08–1.44]

78 (35.1)

0.99 [0.87–1.13]

1.08 [0.98–1.13]

 20–24 years

202 (40.6)

Reference

Reference

174 (35.8)

Reference

Reference

 25–29 years

354 (40.4)

0.99 [0.84–1.20]

0.97 [0.79–1.31]

305 (34.8)

0.92 [0.76–1.10]

0.93 [0.85–1.03]

 30–35 years

368 (40.3)

0.88 [0.69–1.14]

0.89 [0.74–1.12]

315 (34.5)

0.89 [0.79–1.09]

0.88 [0.77–1.12]

 > 35 years

214 (39.8)

0.98 [0.77–1.31]

0.98 [0.79–1.18]

184 (34.4)

0.99 [0.84–1.03]

0.98 [0.85–1.09]

Smoking Cigarettes

 No smoking

1135 (40.7)

0.98 [0.66–1.24]

 

969 (34.9)

0.89 [0.67–1.16]

 

 Smoking

91 (34.8)

Reference

 

87 (32.5)

Reference

 

Diabetes (Type 1, 2, GDM)

 Not Diabetes

1128 (39.7)

Reference

Reference

981 (34..6)

Reference

Reference

 Diabetes

98 (50.5)

0.51 [0.33–0.75]*

0.55 [0.35–0.88]*

75 (38.6)

0.68 [0.56–0.78]*

0.64 [0.54–0.76]*

Hypertension (chronic, pregnancy-induced, preeclampsia)

 Not hypertension

1150 (37.7)

Reference

 

987 (40.6)

Reference

 

 Hypertension

79 (38.3)

0.88 [0.62–1.15]

 

74 (37.2)

0.83 [0.61–1.16]

 

Received Prenatal care

 No

17 (45.0)

1.48 [0.44–4.09]

 

19 (39.0)

1.48 [0.49–5.01]

 

 Yes

1212 (40.2)

Reference

 

1042 (38.2)

Reference

 

Induction

 No

401 (44.7)

Reference

Reference

304 (34.2)

Reference

Reference

 Yes

828 (54.9)

1.61 [1.08–2.81]*

1.77 [1.00–2.87]*

757 (45.5)

1.63 [1.08–2.83]*

1.71 [1.00–2.87]*

Epidural Anesthesia

 No

205 (15.5)

Reference

Reference

135 (10.7)

Reference

Reference

 Yes

1024 (30.9)

1.26 [0.86–1.68]*

1.62 [1.12–2.39]*

926 (28.6)

1.31 [0.96–1.78]*

1.78 [1.02–2.44]*

Adherence to 2009 IOM guideline

 Inadequate

108 (88.3)

1.65 [1.10–2.41]*

1.81 [1.15–2.83]*

87 (88.1)

1.69 [1.10–2.53]*

1.88 [1.11–2.92]*

 Appropriate

746 (82.1)

Reference

Reference

716 (83.1)

Reference

Reference

 Excessive

345 (25.1)

0.62 [0.41–0.79]*

0.72 [0.59–1.05]*

268 (20.3)

0.61 [0.51–0.87]*

0.69 [0.59–1.01]*

Estimated Gestational age (weeks)

 EGA ≥34 – < 37

61 (51.2)

Reference

 

58 (47.1)

Reference

 

 EGA 37+

1168 (50.1)

0.89 [0.50–1.31]

 

1003 (48.9)

0.91 [0.60–1.51]

 

Neonate weight

 LGA

182 (50.7)

3.11 [1.81–5.25]*

3.24 [1.93–6.33]*

156 (48.1)

3.28 [1.80–5.49]*

3.55 [1.91–6.03]*

 AGA

982 (38.8)

Reference

Reference

859 (39.6)

Reference

Reference

 SGA

65 (23.1)

0.22 [0.18–0.41]*

0.25 [0.18–0.40]*

46 (19.3)

0.29 [0.20–0.40]*

0.28 [0.18–0.45]*

  1. Adjusted for: age category, smoking, hypertension, prenatal care, epidural, adherence to GWG, race, marital status, parity, diabetes, induction, augmentation, and estimated gestational age
  2. *Significant Odds Ratios at the p < 0.05 level
  3. GDM (Gestational Diabetes Mellitus), GWG (Gestational Weight Gain), IOM (Institute of Medicine), SGA (Small for Gestational Age), AGA (Appropriate of Gestational Age), LGA (Large for Gestational Age)
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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