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Table 1 Comparison of main patients’ characteristics and obstetrical data between symptomatic and asymptomatic women who suffered from obstetric anal sphincter injury during delivery

From: Obstetrical and epidemiological factors influence the severity of anal incontinence after obstetric anal sphincter injury

  Symptomatic, N = 31 Asymptomatic, N = 57 p value
Patients’ characteristics
 Age* (years) 32.5 ± 3.0 30.4 ± 4.4 0.02
 Body mass index*(kg/m2) 26.9 ± 3.5 28.6 ± 4.4 0.01
 Gestational diabetes (%) 6 7 0.6
Obstetrical data
 Weeks of pregnancy* 39.1 ± 1.3 39.4 ± 1.3 0.62
 Birth weight (g)* 3428.8 ± 397.8 3378.3 ± 426.6 0.5
 Instrumental delivery (%) 51 54 0.5
  - Forceps (%) 9.7 1.8 0.04
  - Fetal distress a (%) 43.7 48.3 0.4
 Non-occiput anterior presentation (%) 16 17 0.6
 2nd stage of labor (min)* 104.3 ± 62.8 98.9 ± 76.0 0.5
 Episiotomy (%) 45 49 0.4
 Nulliparous at delivery (%) 67 54 0.1
 Induced labor (%) 22 24 0.5
 Oxytocin during 2nd stage of labor (%) 67 66 0.5
 Epidural anaesthesia (%) 58 66 0.2
 Estimated blood loss (ml)* 498.3 (166.7) 548.2 ± 402.6 0.2
 Male infant (%) 61 52 0.3
Degree of OASI (%)
 3a 38 54 0.3
 3b 45 33 0.4
 3c 10 7 0.7
 4 7 6 0.6
Follow-up assessment
 Follow-up interval in weeks* 27.1 ± 2.5 28.5 ± 48.1 0.6
 IAS-width (mm)* 1.5 ± 0.4 1.5 ± 0.5 0.8
 EAS-width (mm)* 5.0 ± 1.7 5.5 ± 2.1 0.3
 Perineum length (cm) * 2.3 ± 0.6 2.2 ± 0.7 0.5
 Pelvic floor strength (Oxford scale)* 2.0 ± 0.6 2.1 ± 0.8 0.5
 Kelly-Holschneider Score * 18.2 ± 1.5 19.9 ± 1.1 0.2
  1. All values are in means for continuous numerical data or values for discrete data; in brackets the standard deviation and the percentage respectively. For data marked with (*), the Mann-Whitney U test was used to compare means and calculate the p values, all others with the Fisher’s exact test
  2. a: fetal distress as indication for instrumental delivery (forceps or vacuum)