Results of logistic regression for risk of re-operation for UI
| Risk factor | UI operation | Unadjusted analysis | Adjusted analysis | |||
| One (N=695) | >1 (N=67) | OR (95% CI) | p Value | OR (95% CI) | p Value | |
| Type of first UI surgery | ||||||
| Abdominal retropubic procedures | 285 (41.0%) | 34 (50.7%) | 1.00 | 1.00 | ||
| Mid-urethral slings | 331 (47.6%) | 11 (16.4%) | 0.28 (0.14 to 0.56) | <0.001 | 0.30 (0.15 to 0.60) | 0.001 |
| Anterior colporrhapy | 66 (99.5%) | 14 (20.9%) | 1.78 (0.90 to 3.50) | 0.096 | 1.92 (0.97 to 3.82) | 0.063 |
| Peri-urethral injectables | 5 (0.7%) | 5 (7.5%) | 8.38 (2.31 to 30.4) | 0.001 | 9.05 (2.42 to 33.8) | 0.001 |
| Repair of uro-genital fistulae | 8 (1.2%) | 3 (4.5%) | 3.14 (0.80 to 12.4) | 0.102 | 2.50 (0.58 to 10.8) | 0.22 |
| Mode of delivery | ||||||
| SVD only | 488 (700.2%) | 45 (67.2%) | 1.00 | |||
| CS only | 16 (2.3%) | 2 (3.0%) | 1.36 (0.30 to 6.08) | 0.69 | ||
| At least one forceps | 158 (22.7%) | 14 (20.9%) | 0.96 (0.51 to 1.80) | 0.90 | ||
| At least one instrumental but no forceps | 9 (1.3%) | 3 (4.5%) | 3.62 (0.95 to 13.8) | 0.06 | ||
| SVD+CS | 24 (3.5%) | 3 (4.5%) | 1.36 (0.39 to 4.68) | 0.63 | ||
| Age at first delivery | ||||||
| Under 20 years | 166 (23.9%) | 16 (23.9%) | 0.93 (0.51 to 1.67) | 0.80 | ||
| 20–29 years | 470 (67.6%) | 49 (73.1%) | 1.00 | |||
| 30–49 years | 59 (8.5%) | 2 (3.0%) | 0.33 (0.08 to 1.37) | 0.13 | ||
| Total number of deliveries | ||||||
| One | 116 (16.7%) | 10 (14.9%) | 1.00 | |||
| 2–4 | 558 (80.3%) | 56 (83.6%) | 1.16 (0.58 to 2.35) | 0.67 | ||
| 5+ | 21 (3.0%) | 1 (1.5%) | 0.55 (0.07 to 4.55) | 0.58 | ||
| Occurrence of twins | ||||||
| No | 687 (98.8%) | 67 (100%) | ||||
| Yes | 8 (1.2%) | 0 (0%) | ||||
| Time between deliveries | ||||||
| One delivery | 116 (16.7%) | 10 (14.9%) | 1.00 | |||
| All <2 years | 89 (12.8%) | 8 (11.9%) | 1.04 (0.40 to 2.75) | 0.93 | ||
| All ≥2 years | 354 (19.6%) | 10 (14.9%) | 1.28 (0.62 to 2.64) | 0.51 | ||
| Mixture | 136 (19.6%) | 10 (14.9%) | 0.85 (0.34 to 2.12) | 0.73 | ||
| Type of perineal wound | ||||||
| No wound | 239 (34.4%) | 26 (38.8%) | 1.00 | 1.00 | ||
| All episiotomy | 211 (30.4%) | 28 (41.8%) | 1.22 (0.69 to 2.15) | 0.49 | 1.22 (0.68 to 2.19) | 0.51 |
| At least one third-degree tear | 1 (0.1%) | 1 (1.5%) | 9.19 (0.56 to 151) | 0.12 | 4.83 (0.25 to 92.8) | 0.30 |
| No perineal tears (lacerations only) | 244 (35.1%) | 12 (17.9%) | 0.45 (0.22 to 0.92) | 0.028 | 0.46 (0.22 to 0.95) | 0.037 |
CS, caesarean section; SVD, spontaneous vaginal delivery; UI, urinary incontinence.