Skip to main content

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)