Table 5. Results of multivariable logistic regression model for colorectal cancer showing characteristics predictive of death within 30 days of diagnosis.
| Characteristic | Odds ratio | 95% Confidence interval | P-value | |
|---|---|---|---|---|
| Age group | ||||
| <65 | 1.00 | |||
| 65–74 | 2.50 | 1.28 | 4.89 | 0.007 |
| 75–79 | 5.41 | 2.76 | 10.60 | <0.001 |
| 80–84 | 11.13 | 5.78 | 21.43 | <0.001 |
| 85+ | 15.92 | 8.15 | 31.07 | <0.001 |
| SIMD fifth | ||||
| 1-Least deprived | 1.00 | |||
| 2 | 1.22 | 0.97 | 1.55 | 0.095 |
| 3 | 1.43 | 1.14 | 1.79 | 0.002 |
| 4 | 1.34 | 1.07 | 1.69 | 0.01 |
| 5-Most deprived | 1.16 | 0.92 | 1.46 | 0.204 |
| Previous inpatient bed days | ||||
| 0 | 1.00 | |||
| 1–7 | 0.81 | 0.67 | 0.98 | 0.026 |
| 8–28 | 0.87 | 0.72 | 1.05 | 0.135 |
| 29+ | 0.96 | 0.78 | 1.17 | 0.669 |
| Previous admission for COPD | ||||
| No | 1.00 | |||
| Yes | 1.46 | 1.17 | 1.84 | 0.001 |
| Previous alcohol-related admission | ||||
| No | 1.00 | |||
| Yes | 1.59 | 1.19 | 2.12 | 0.002 |
| Emergency admissions within 30 days of diagnosis date | ||||
| 0 | 1.00 | |||
| ⩾1 | 9.41 | 5.45 | 16.25 | <0.001 |
| Microscopically verified | ||||
| Yes | 1.00 | |||
| No | 8.43 | 4.92 | 14.45 | <0.001 |
| Not known | 3.27 | 0.81 | 13.13 | 0.095 |
| Tumour sub-site | ||||
| Proximal colon | 1.00 | |||
| Distal colon | 1.25 | 1.04 | 1.50 | 0.02 |
| Rectum/rectosigmoid | 1.11 | 0.92 | 1.35 | 0.272 |
| Not known | 2.19 | 1.80 | 2.67 | <0.001 |
| Dukes' stage | ||||
| A or B | 1.00 | |||
| C | 1.48 | 1.12 | 1.94 | 0.006 |
| D | 1.71 | 1.26 | 2.32 | 0.001 |
| Not known | 1.35 | 0.98 | 1.84 | 0.064 |
| Tumour grade | ||||
| I–II | 1.00 | |||
| III–IV | 1.50 | 1.20 | 1.88 | <0.001 |
| Not known | 1.48 | 1.22 | 1.79 | <0.001 |
| Any treatment within 30 days of diagnosis | ||||
| Yes | 1.00 | |||
| No | 0.17 | 0.08 | 0.38 | <0.001 |
Abbreviations: COPD=chronic obstructive pulmonary disease; SIMD=Scottish index of multiple deprivation.
Interaction terms age × emergency admissions, age × microscopic verification, age × any treatment, and Dukes' stage × any treatment were included in the model.