Table I.
Characteristics of the study population (n=9579) by mortality status.
| Characteristic | Alive (n=7818; 81.6%) | Lung cancer mortality (n=886; 9.3%) | Other-cause mortality (n=875; 9.1%) | P-value |
|---|---|---|---|---|
| Age, years (mean ± SD)a | 63.1±8.3 | 67.9±7.5 | 69.6±7.3 | <0.0001 |
| Genderb, n (%) | <0.0001 | |||
| Male | 3637 (77.4) | 509 (10.8) | 556 (11.8) | |
| Female | 4181 (85.7) | 377 (7.7) | 319 (6.5) | |
| Smoking durationa | <0.0001 | |||
| Mean ± SD | 16.6±18.2 | 41.1±14.4 | 26.5±19.6 | |
| Median | 10 | 44 | 29 | |
| BMIa, mean ± SD | 27.0±4.8 | 27.3±11.1 | 26.8±5.3 | 0.0001 |
| Educationb, n (%) | <0.0001 | |||
| ≤High school graduate | 1235 (93.1) | 29 (2.2) | 62 (4.7) | |
| ≥College | 6583 (79.8) | 857 (10.4) | 813 (9.9) | |
| Marital statusb, n (%) | <0.0001 | |||
| Married | 4903 (83.5) | 505 (8.6) | 462 (7.9) | |
| Other | 2277 (83.9) | 183 (6.7) | 255 (9.4) | |
| Family history of lung cancerb, n (%) | 0.0030 | |||
| No | 6309 (80.9) | 751 (9.6) | 739 (9.5) | |
| Early onset (≤60 years) | 458 (86.1) | 39 (7.3) | 35 (6.6) | |
| Late onset (≥60 years) | 1051 (84.2) | 96 (7.7) | 101 (8.1) | |
| CCISb, n | <0.0001 | |||
| 0 | 423 (98.6) | 5 (1.2) | 1 (0.2) | |
| 1–2 | 4027 (92.8) | 229 (5.3) | 84 (1.9) | |
| ≥3 | 3368 (70.0) | 652 (13.6) | 790 (16.4) |
a
P-values derived from univariate Cox regression;
b
P-values derived from the log-rank test.
SD, standard deviation; BMI, body mass index; CCIS, Charlson comorbidity index score.