Table 1.
Factors effecting epidural failure at 48 and 96 hours
| Number | % | 48-hour failure rate (%) | Odds ratio of failure vs remainder of cohort (95% confidence interval) | P value | 96-hour failure rate (%) | Odds ratio of failure vs remainder of cohort (95% confidence interval) | P value | |
|---|---|---|---|---|---|---|---|---|
| Gender | ||||||||
| Male | 347 | 39.4 | 25.6 | 0.82 (0.60-1.11) | 0.21 | 37.5 | 1.33 (1.00-1.77) | 0.06 |
| Female | 534 | 60.6 | 29.6 | 31.1 | ||||
| Age | ||||||||
| ≤65 | 420 | 48.5 | 30.7 | 1.42 (1.05-1.92) | 0.02 | 38.6 | 1.54 (1.16-2.05) | <0.01 |
| >65 | 446 | 51.5 | 23.8 | 28.9 | ||||
| Surgical specialty | ||||||||
| Colorectal | 389 | 44.3 | 28.0 | 1.11 (0.82-1.50) | 0.49 | 34.4 | 1.10 (0.83-1.14) | 0.52 |
| Upper gastrointestinal | 183 | 20.8 | 20.2 | 0.71 (0.48-1.04) | 0.07 | 28.8 | 0.77 (0.54-1.11) | 0.16 |
| Urology | 161 | 18.3 | 26.1 | 0.95 (0.64-1.40) | 0.78 | 34.2 | 1.05 (0.73-1.51) | 0.78 |
| Vascular | 73 | 8.3 | 31.5 | 1.30 (0.77-2.19) | 0.32 | 36.1 | 1.17 (0.71-1.94) | 0.59 |
| Gynaecology | 67 | 7.6 | 34.3 | 1.50 (0.88-2.55) | 0.14 | 34.8 | 1.08 (0.64-1.83) | 0.77 |
| Level of incision | ||||||||
| Above umbilicus | 250 | 28.4 | 21.3 | 0.65 (0.46-0.92) | 0.02 | 29.9 | 0.79 (0.57-1.08) | 0.15 |
| Below umbilicus | 210 | 23.8 | 33.0 | 1.45 (1.03-2.03) | 0.03 | 36.4 | 1.17 (0.85-1.63) | 0.34 |
| Both | 421 | 47.7 | 27.2 | 1.06 (0.78-1.42) | 0.72 | 34.4 | 1.07 (0.81-1.42) | 0.63 |
| Seniority of anaesthetist | ||||||||
| Consultant | 670 | 77.2 | 25.6 | 0.73 (0.51-1.03) | 0.07 | 31.7 | 0.68 (0.49-0.95) | 0.03 |
| Locum | 72 | 8.3 | 36.6 | 1.60 (0.96-2.65) | 0.07 | 47.9 | 1.92 (1.18-3.13) | 0.01 |
| Trainee | 71 | 8.2 | 27.1 | 1.00 (0.58-1.74) | 0.99 | 37.1 | 1.18 (0.71-1.96) | 0.52 |
| Specialty doctor | 55 | 6.3 | 32.7 | 1.33 (0.74-2.39) | 0.33 | 34.5 | 1.09 (0.61-1.93) | 0.77 |