Table 1. Demographic Characteristics of the Participants.
| Characteristica | Lung Cancer | Nontumor Lung Diseases | Other Diseases | Controls | All Participants |
|---|---|---|---|---|---|
| Sample size, No. | 606 | 593 | 883 | 964 | 3046 |
| Age, mean (SD), y | 65.4 (9.1) | 65.8 (10.1) | 63.7 (15.1) | 52.4 (20.7) | 61.1 (16.3) |
| Age group, No. (%), y | |||||
| <55 | 84 (13.9) | 60 (10.2) | 206 (24.1) | 357 (40.5) | 707 (24.1) |
| 55-59 | 72 (11.9) | 60 (10.2) | 90 (10.5) | 56 (6.4) | 278 (9.5) |
| 60-64 | 127 (21.0) | 105 (17.8) | 102 (11.9) | 135 (15.3) | 469 (16.0) |
| 65-69 | 120 (19.8) | 129 (21.9) | 104 (12.2) | 151 (17.1) | 504 (17.2) |
| 70-75 | 115 (19.0) | 147 (25.0) | 121 (14.2) | 93 (10.6) | 476 (16.3) |
| >75 | 87 (14.4) | 88 (14.9) | 231 (27.0) | 89 (10.1) | 495 (16.9) |
| Totalb | 605 (99.8) | 589 (97.8) | 854 (96.7) | 881 (91.4) | 2929 (96.2) |
| Sex, No. (%) | |||||
| Male | 390 (67.1) | 386 (65.5) | 484 (61.9) | 467 (51.7) | 1727 (60.5) |
| Female | 191 (32.9) | 203 (34.5) | 298 (38.1) | 437 (48.3) | 1129 (39.5) |
| Totalb | 581 (95.9) | 589 (99.3) | 782 (88.6) | 904 (93.8) | 2856 (93.8) |
| Smoking status, No. (%) | |||||
| Never | 31 (9.1) | 27 (4.8) | 302 (51.8) | 346 (64.4) | 706 (35.0) |
| Past | 113 (33.3) | 398 (71.3) | 181 (31.0) | 161 (30.0) | 853 (42.3) |
| Present | 195 (57.5) | 133 (23.8) | 100 (17.2) | 30 (5.6) | 458 (22.7) |
| Total | 339 (55.9) | 558 (94.1) | 583 (66.0) | 537 (55.7) | 2017 (66.2) |
| Cumulative tobacco use (among smokers), mean (SD), pack-years | 42.3 (23.9) | 49.3 (36.6) | 19.6 (21.0) | 13.1 (14.1) | 40.5 (32.1) |
a
Information about age was available in 96.2% of cases (n = 2929), sex in 93.8% (n = 2856) smoking history in 66.2% (n = 2017), and the TNM classification and/or corresponding Union for International Cancer Control stage in 74.9% of cases (n = 454).
b
Total values do not reflect the sample size because some patients did not provide information on specific characteristics.