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) |