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Table 3 Successful assisted vaginal delivery in relation to participant characteristics among women (N = 1987)

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

Characteristics Successful Vacuum Successful 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 < 25.0) 791 (85.6) Reference Reference 703 (85.6) Reference Reference
 Obese (≥30.0) 262 (86.3) 1.19 [0.59–2.28] 1.09 [0.58–2.34] 231 (96.3) 1.69 [1.07–3.18]* 1.79 [1.11–3.53]*
Age (years)
 < 20 17 (89.4) 1.11 [1.02–1.23]   11 (84.6) 0.97 [0.01–1.11]  
 20–24 98 (94.2) Reference   88 (88.8) Reference  
 25–29 312 (88.9) 0.97 [0.74–1.22]   271 (87.5) 0.85 [0.76–1.12]  
 30–35 512 (84.9) 0.91 [0.69–1.21]   441 (88.6) 0.87 [0.74–1.18]  
 > 35 114 (75.1) 0.99 [0.77–1.31]   123 (87.2) 0.95 [0.71–1.23]  
Smoking Cigarettes
 No Smoking 974 (85.7) 0.88 [0.68–1.06]   874 (87.9) 0.92 [0.72–1.09]  
 Smoking 79 (84.0) Reference   60 (89.5) Reference  
Diabetes (Type 1, 2, GDM)
 Not Diabetes 994 (87.8) Reference Reference 889 (90.1) Reference Reference
 Diabetes 59 (60.8) 0.49 [0.31–0.74]* 0.45 [0.27–0.68]* 45 (60.1) 0.40 [0.26–0.71]* 0.44 [0.24–0.66]*
Hypertension (chronic, pregnancy–induced, preeclampsia)
 Not hypertension 985 (85.7) Reference   867 (87.8) Reference  
 Hypertension 68 (86.1) 0.92 [0.72–1.12]   67 (90.1) 0.85 [0.91–1.18]  
Received Prenatal Care
 No 15 (88.2) 1.08 [0.74–1.49]   17 (89.4) 1.05 [0.79–1.31]  
 Yes 1038 (85.6) Reference   917 (88.2) Reference  
Induction
 No 345 (86.1) Reference Reference 265 (87.1) Reference Reference
 Yes 708 (85.5) 1.01 [0.78–1.61] 1.07 [0.80–1.67] 668 (88.2) 1.03 [0.78–1.63] 1.01 [0.80–1.57]
Epidural
 No 185 (90.2) Reference Reference 115 (85.2) Reference Reference
 Yes 868 (84.8) 1.06 [0.85–1.58] 1.07 [0.82–1.39] 819 (88.6) 1.01 [0.76–1.68] 1.08 [0.82–1.44]
Adherence To 2009 IOM Guideline
 Inadequate 94 (87.3) 1.05 [0.80–1.41]   78 (89.6) 1.09 [0.78–1.53]  
 Appropriate 659 (84.9) Reference   619 (87.7) Reference  
 Excessive 300 (86.9) 0.92 [0.71–1.12]   237 (88.4) 0.95 [0.71–1.47]  
Estimated Gestational Age
 EGA < 37 52 (85.2) Reference   50 (86.2) Reference  
 EGA 37+ 1001 (85.7) 0.99 [0.70–1.31]   884 (88.1) 0.95 [0.69–1.44]  
Neonate weight
 SGA 75 (91.7) 3.21 [1.84–5.55]* 3.14 [1.96–6.03]* 137 (87.7) 3.08 [1.89–5.79]* 3.05 [1.99–5.53]*
 AGA 918 (93.0) Reference Reference 758 (88.2) Reference Reference
 LGA 65 (92.3) 0.26 [0.15–0.45]* 0.24 [0.16–0.44]* 39 (84.8) 0.28 [0.17–0.44]* 0.29 [0.16–0.47]*
  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 (Average for Gestational Age), LGA (Large for Gestational Age)