Summary of the multivariate analysis results for the association between selected prognostic variables and survival
| Variable | Category/term | HR (95% CI) | P value |
| Age at diagnosis* | – | 1.31 (1.09 to 1.56) | 0.004 |
| Smoking status | Non-smoker | 1 | 0.03 |
| Ex-smoker | 2.16 (1.09 to 1.56) | ||
| Current smoker | 3.42 (1.11 to 4.20) | ||
| Chest pain | No | 1 | 0.007 |
| Yes | 2.14 (1.23 to 3.72) | ||
| Weight loss | No | 1 | 0.01 |
| Yes | 2.13 (1.18 to 3.86) | ||
| PLT† | Linear term | 1.05 (0.91 to 1.20) | 0.01 |
| Squared term | 1.05 (1.00 to 1.10) | ||
| Urea* | – | 2.73 (1.31 to 5.69) | 0.008 |
| Adjusted calcium‡ | – | 1.47 (1.10 to 1.94) | 0.008 |
*HRs reported for a 5-unit increase in variable.
†HRs reported for a 50-unit increase in variable.
‡HRs reported for a 0.1-unit increase in variable.