BioMed Research International / 2014 / Article / Tab 2

Research Article

Maternal Body Mass Index and Risk of Obstetric Anal Sphincter Injury

Table 2

Risk factors for partial anal sphincter injury ( ), total anal sphincter injury ( ), and total anal sphincter injury involving the anal/rectal mucosa ( ) among primiparous women with singleton vaginal cephalic births at term. OR for each variable studied in relation to anal sphincter injury was adjusted for all other variables and for year of delivery.

Partial anal sphincter injury
ICD O70.2A%
Adjusted OR95% CITotal anal sphincter injury
ICD O70.2B%
Adjusted OR95% CITotal anal sphincter injuries involving the anal/rectal mucosa
ICD O70.3%
Adjusted OR95% CI

Maternal body mass index
 Unknown4.40.990.94–1.041.20.890.81–0.960.50.920.80–1.04
 Less than 18.54.11.241.14–1.361.41.481.27–1.740.61.421.12–1.81
 18.5–24.94.41.00Reference1.31.00Reference0.61.00Reference
 25–29.94.40.920.88–0.951.30.900.84–0.970.60.950.88–1.05
 30–34.94.30.900.84–0.961.10.770.67–0.880.50.780.64–0.94
 35–39.93.90.790.70–0.901.00.650.50–0.830.50.790.56–1.12
 40 or more4.20.820.66–1.020.70.470.28–0.780.70.840.48–1.44
Maternal age, y
 Younger than 201.30.320.28–0.360.50.460.38–0.570.20.440.32–0.59
 20–242.80.640.61–0.680.90.680.63–0.740.40.670.60–0.75
 25–294.61.00Reference1.31.00Reference0.61.00Reference
 30–345.51.161.13–1.201.51.071.00–1.140.71.010.92–1.11
 35–395.51.141.09–1.211.40.960.86–1.060.60.840.71–0.98
 40–445.11.020.89–1.161.00.730.55–0.960.40.560.36–0.80
 45 or older3.41.741.18–1.360.7
Fetal head position
 Occipitoanterior position4.31.00Reference1.21.00Reference0.61.00Reference
 Occipitoposterior position6.81.271.18–1.362.51.601.43–1.791.11.561.32–1.84
 Others7.61.491.28–1.322.51.661.21–2.120.91.250.83–1.89
Instrumental delivery
 No3.31.00Reference0.91.00Reference0.41.00Reference
 Yes9.52.622.58–2.702.02.932.78–3.101.42.922.70–3.16
Infant birth weight
 Less than 30001.80.800.75–0.860.40.800.64–0.920.20.740.58–0.94
 3000–34993.11.00 Reference0.81.00 Reference0.31.00 Reference
 3500–39995.01.321.28–1.371.41.431.34–1.530.71.501.36–1.65
 4000–44997.82.52 2.42–2.632.62.882.67–3.101.33.202.87–3.56
 4500–499911.45.605.21–6.034.27.916.9–8.932.39.778.26–11.54
 5000 or more14.28.997.40–10.915.916.0512.06–21.372.921.5413.91–33.38

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