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Table 1 Maternal, labor, neonatal and hospital characteristics without and with mediolateral episiotomy in nulliparous women with singleton pregnancy delivering by operative vaginal delivery at term

From: Mediolateral episiotomy and risk of obstetric anal sphincter injuries and adverse neonatal outcomes during operative vaginal delivery in nulliparous women: a propensity-score analysis

Characteristics, n (%) Mediolateral episiotomy
N = 2880
No mediolateral episiotomy
N = 4709
P Value *
Maternal characteristics
Maternal age, years    0.08
  < 25 933 (32.4) 1414 (30.0)  
 25–34 1753 (60.9) 2954 (62.7)  
  > 35 194 (6.7) 341 (7.3)  
Body mass index, kg/m2    0.01
  < 18.5 183 (7.4) 314 (7.2)  
 18.5–24.9 1597 (65.4) 2774 (63.7)  
 25–29.9 456 (18.7) 812 (18.7)  
  ≥ 30 207 (8.5) 448 (10.3)  
 Missing data 437 361  
Smoking during pregnancy 374 (13.0) 714 (15.1) 0.01
Gestational diabetes 225 (7.8) 478 (10.1) 0.01
Hypertension disorder of pregnancy 105 (3.6) 190 (4.0) 0.39
Labor, neonatal characteristics
 Induction of labor 581 (20.2) 1010 (21.5) 0.18
 Gestational age at delivery >  41 WG 423 (14.7) 760 (16.1) 0.09
 Epidural analgesia 2723 (94.6) 4241 (90.1) 0.01
 Fetal distress during labor 1134 (39.4) 2034 (43.2) 0.01
 Occiput posterior position 63 (2.1) 73 (1.6) 0.04
Operative vaginal delivery    0.01
 Forceps/spatula delivery 1433 (50.2 1265 (26.9)  
 Vacuum delivery 1421 (49.8) 3432 (73.1)  
 Missing data 26 12  
Birth weight, g    0.01
  < 2500 42 (1.5) 130 (2.8)  
 2500–3999 2553 (91.9) 4362 (92.9)  
  > 4000 184 (6.6) 199 (4.2)  
 Missing data 1 18  
Small for gestational age < 10th percentile 213 (7.4) 500 (10.6) 0.01
Hospital characteristics    0.01
 Level I maternity unit 1093 (38.0) 693 (14.7)  
 Level II maternity unit 966 (33.5) 2202 (46.8)  
 Level III maternity unit 821 (28.5) 1814 (38.5)  
  1. WG weeks of gestation. * The 2 groups were compared by the Chi2 tests. Growth curves adjusted for gestational age and gender. For each variable, percentages might not sum up to 100%, due to rounding