Table 2.
Multivariate risk analysis of any complication controlled for other variables
| Grouping | Variable | Odds ratio (range) | p-value |
|---|---|---|---|
| Sex | Male | 1.000 | 0.416 |
| Female | 0.834 (0.539–1.291) | ||
| Age | 1.006 (0.994–1.018) | 0.304 | |
| Operation | Laparoscopic | 1.000 | 0.015 |
| Open | 2.084 (1.152–3.771) | ||
| White cell count (x 109/l) | <11 | 1.000 | |
| 11–14.9 | 0.822 (0.491–1.375) | 0.455 | |
| 15–19.9 | 0.565 (0.309–1.034) | 0.064 | |
| 20–24.9 | 0.873 (0.367–2.077) | 0.758 | |
| 25+ | 2.660 (0.733–9.725) | 0.137 | |
| C-reactive protein (mg/l) | <50 | 1.000 | |
| 50–99.9 | 1.011 (0.535–1.912) | 0.973 | |
| 100–149.9 | 1.099 (0.508–2.378) | 0.811 | |
| 150–199.9 | 2.159 (1.004–4.639) | 0.049 | |
| 200–249.9 | 5.646 (2.526–12.619) | <0.001 | |
| 250–299.9 | 3.400 (1.131–10.227) | 0.029 | |
| 300–349.9 | 3.784 (1.295–11.062) | 0.015 | |
| 350+ | 8.234 (1.398–48.517) | 0.020 | |
| Perforation | No | 1.000 | |
| Yes | 1.327 (0.668–2.635) | 0.419 |