Results of multiple regression analysis for profusion category 1/0 and greater and profusion category 1/1 and greater (median scores) on age and the cumulative exposure index, for all opacities and corrected for smoking habits
| n | PR (95% CI*) for profusion category 1/0 and greater | PR (95% CI*) for profusion category 1/1 and greater | |
|---|---|---|---|
| *Confidence interval. | |||
| †Reference: men who smoked less than two pack-years, younger than 35 years, and with a cumulative exposure index of less than 4. | |||
| ‡−2 log likelihood without covariates: 1876.8. | |||
| §−2 log likelihood without covariates: 530.1. | |||
| Reference† | 1 | 1 | |
| Exposure | |||
| 4–7.99 | 417 | 0.83 (0.47 to 1.47) | 0.89 (0.21 to 3.80) |
| 8–14.99 | 335 | 1.05 (0.59 to 1.84) | 2.05 (0.55 to 7.70) |
| ⩾15 | 281 | 1.60 (0.91 to 2.81) | 4.69 (1.30 to 16.9) |
| Age | |||
| 36–41 | 350 | 1.46 (0.80 to 2.68) | 1.25 (0.36 to 4.41) |
| 42–48 | 315 | 1.62 (0.87 to 2.99) | 1.81 (0.54 to 6.05) |
| ⩾49 | 296 | 1.80 (0.95 to 3.38) | 1.64 (0.47 to 5.66) |
| Pack years | |||
| 2–11.9 | 436 | 1.61 (0.93 to 2.80) | 1.45 (0.54 to 3.94) |
| 12–19.9 | 248 | 2.15 (1.20 to 3.84) | 2.06 (0.72 to 5.85) |
| ⩾20 | 252 | 2.56 (1.46 to 4.48) | 1.80 (0.65 to 5.03) |
| −2 log likelihood | 1838.2‡ | 507.9§ | |