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Table 2 Odds ratios from univariate regression model of OASIS vs. risk factors

From: Can the risk of obstetric anal sphincter injuries (OASIs) be predicted using a risk-scoring system?

Variable 95% CI OR Subgroup p-value
Maternal age in years 0.99-1.02 1.01   0.415
Ethnicity - 1 Caucasian -
1.75-2.74 2.19 South Asian < 0.001
0.60-0.95 0.76 Afro-Caribbean 0.019
1.05-3.65 1.96 East Asian 0.035
0.97-1.55 1.23 Other 0.082
Multiparity 0.34-0.45 0.39   < 0.001
Smoking status - 1 Non-smoker -
0.77-1.35 1.01 Ex-smoker 0.891
0.21-0.46 0.31 Smoker < 0.001
Place of delivery - 1 Hospital -
0.08-0.60 0.22 Home 0.003
0.37-3.77 1.18 Other 0.779
Mode of delivery - 1 Vaginal -
5.08-8.94 6.74 Forceps < 0.001
1.92-3.10 2.44 Ventouse < 0.001
Epidural - 1 No -
1.24-1.94 1.55 Yes < 0.001
Other analgesia - 1 None -
0.30-5.13 1.24 CSE 0.766
5.59-11.87 8.14 Spinal < 0.001
0.23-12.89 1.71 Epidural 0.605
1.42-2.62 1.93 Water immersion < 0.001
Duration of 2nd stage in minutes 1.05-1.08 1.07   < 0.001
Water birth 0.74-2.20 1.27   0.378
Shoulder dystocia - 1 No -
2.34-5.10 3.46 Yes < 0.001
Mediolateral episiotomy - 1 No -
2.14-3.08 2.57 Yes < 0.001
Birth weight (grams) 1.0004-1.0008 1.0006   < 0.001
Head circumference (mm) 1.11-1.23 1.16   < 0.001