Table 7.
Cox proportional hazard regression models for cause-specific survival for male lung and bronchus cancer patients by detailed occupation status: Florida Cancer Data System (1981–2014).
| Occupation | Univariate models | Multivariable models | ||||
|---|---|---|---|---|---|---|
| Model 1 | Model 2 | |||||
| HR (95% CI) | p-value | aHR (95% CI) | p-value | aHR (95% CI) | p-value | |
| Non-firefighters | 1.00 (reference) | 1.00 (reference) | – | |||
| Firefighters | 0.82 (0.75, 0.89) | <0.001 | 0.84 (0.77, 0.91) | <0.001 | – | |
| Non-firefighters | 1.00 (reference) | 1.00 (reference) | – | |||
| Volunteer firefighters | 0.84 (0.70, 1.01) | 0.063 | 0.76 (0.63, 0.91) | 0.003 | – | |
| Career firefighters | 0.81 (0.74, 0.89) | <0.001 | 0.86 (0.79, 0.95) | 0.002 | – | |
| Volunteer firefighters | 1.00 (reference) | 1.00 (reference) | – | |||
| Career firefighters | 0.96 (0.79, 1.18) | 0.718 | 1.14 (0.93, 1.39) | 0.213 | – | |
| Firefighters | 1.00 (reference) | 1.00 (reference) | – | |||
| Non-firefighters | 1.22 (1.13, 1.33) | <0.001 | 1.20 (1.10, 1.30) | <0.001 | – | |
| Firefighters | 1.00 (reference) | – | 1.00 (reference) | |||
| White collar | 1.06 (0.98, 1.16) | 0.166 | – | 1.11 (1.02, 1.21) | 0.016 | |
| Blue collar | 1.17 (1.08, 1.28) | <0.001 | – | 1.15 (1.05, 1.25) | 0.002 | |
| Service | 1.13 (1.02, 1.24) | 0.016 | – | 1.13 (1.03, 1.25) | 0.012 | |
| Others/unknown | 1.23 (1.14, 1.34) | <0.001 | – | 1.21 (1.12, 1.32) | <0.001 | |
The multivariable models are additionally adjusted with variables such as year of cancer diagnosis, age at diagnosis, race, ethnicity, insurance, SES, cigarette use, SEER stage, histology, surgery as a treatment received, radiation therapy received, and chemotherapy received. Estimates for the variables used for adjustment were provided in Supplementary Table 1 .
–, not applicable; HR, hazard ratio; aHR, adjusted hazard ratio; 95% CI, 95% confidence interval.