Table 4.
Odds of an attempted laparoscopic operation being converted to an open procedure
| Complete case | Multiple imputation | |||
|---|---|---|---|---|
| Odds ratio | P | Odds ratio | P | |
| Age at diagnosis (per 10 years) | 1·02 (0·96, 1·07) | 0·553 | 1·04 (0·99, 1·09) | 0·152 |
| Year of diagnosis | 1·05 (0·97, 1·14) | 0·198 | 1·05 (0·98, 1·13) | 0·189 |
| Sex | < 0·001 | < 0·001 | ||
| M | 1·00 | 1·00 | ||
| F | 0·63 (0·56, 0·71) | 0·65 (0·58, 0·73) | ||
| Operation type | < 0·001 | < 0·001 | ||
| Elective | 1·00 | 1·00 | ||
| Emergency | 2·05 (1·51, 2·79) | 2·06 (1·54, 2·76) | ||
| Modified Dukes' stage at diagnosis | 0·002 | 0·002 | ||
| A | 1·00 | 1·00 | ||
| B | 1·29 (1·09, 1·52) | 1·28 (1·08, 1·51) | ||
| C | 1·28 (1·08, 1·51) | 1·30 (1·10, 1·54) | ||
| ‘D’ | 1·55 (1·20, 2·00) | 1·56 (1·20, 2·03) | ||
| IMD income category | 0·001 | 0·001 | ||
| 1 (most affluent) | 1·00 | 1·00 | ||
| 2 | 1·03 (0·86, 1·23) | 1·02 (0·86, 1·21) | ||
| 3 | 1·12 (0·94, 1·34) | 1·12 (0·94, 1·33) | ||
| 4 | 1·23 (1·02, 1·48) | 1·25 (1·05, 1·50) | ||
| 5 (most deprived) | 1·47 (1·21, 1·80) | 1·42 (1·17, 1·72) | ||
| Cancer site | < 0·001 | < 0·001 | ||
| Colon | 1·00 | 1·00 | ||
| Rectum | 1·29 (1·13, 1·47) | 1·29 (1·14, 1·46) | ||
| Charlson co-morbidity score | 0·720 | 0·755 | ||
| 0 | 1·00 | 1·00 | ||
| 1 | 1·05 (0·87, 1·26) | 1·04 (0·87, 1·24) | ||
| 2 | 1·00 (0·74, 1·36) | 1·00 (0·74, 1·34) | ||
| ≥ 3 | 0·79 (0·49, 1·25) | 0·81 (0·52, 1·25) | ||
Values in parentheses are 95 per cent confidence intervals. IMD, Index of Multiple Deprivation.