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Table 1 Table of data included in study

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

Variable N (%)
Maternal age in years 28.9 years (SD +/- 6.0 )
Ethnicity  
Caucasian 7,369 (46.4%)
South Asian 1,681 (10.6%)
Afro-Caribbean 4,086 (25.8%)
East Asian 171 (1.1%)
Other 2,564 (16.2%)
Parity  
Nulliparous 6,568 (41.4%)
Para 1 greater than para 1 5,358 (33.8%) 3,945 (24.8%)
Smoking status  
Never smoked 12,499 (78.8%)
Ex-smoker 1,371 (8.6%)
Current smoker 2,001 (12.6%)
Place of delivery  
Hospital 15,350 (96.7%)
Home 454 (2.9%)
Other 67 (0.4%)
Mode of delivery  
Vaginal (non-instrumental) 14,313 (90.2%)
Forceps 372 (2.3%)
Ventouse 1,186 (7.5%)
Epidural 1,791 (11.3%)
Other analgesia  
None 15,647 (98.6%)
CSE 46 (0.3%)
Spinal 161 (1.0%)
Epidural 17 (0.1%)
Water immersion 714 (4.5%)
Duration of 2nd stage in minutes Median 22 mins
(IQR 10–54 mins)
Water birth 298 (1.9%)
Shoulder dystocia 262 (1.7%)
Mediolateral episiotomy 2,347 (14.8%)
Birth weight (grams) 3323 g (SD +/- 509)
Head circumference (cm) 33.9 cm (SD +/- 1.64)