Table 1 Distributions of demographic characteristics among 1,302 lung cancer cases and 1,302 matched healthy controls in the Taiwan GELAC study during 2002–2010.
Variables | Controls | Cases |
|---|---|---|
N (%) | N (%) | |
Age | ||
Mean (years) | 58.62 | 58.55 |
Education | ||
Illiterate | 197 (18.1) | 197 (18.1) |
Elementary school | 425 (39.1) | 425 (39.1) |
Junior high school | 180 (16.6) | 180 (16.6) |
Senior/Vocational high school | 256 (23.6) | 256 (23.6) |
College | 224 (20.6) | 224 (20.6) |
Graduate school | 20 (1.8) | 20 (1.8) |
Lung cancer in first-degree relatives | ||
Yes | 49 (3.8) | 135 (10.4) |
No | 866 (66.5) | 1107 (85) |
Unknown | 387 (29.7) | 60 (4.6) |
Second-hand smoking: Home | ||
Yes | 740 (56.8) | 851 (65.4) |
No | 528 (40.6) | 425 (32.6) |
Unknown | 34 (2.6) | 26 (2) |
Second-hand smoking: Work | ||
Yes | 200 (15.4) | 259 (19.8) |
No | 1102 (84.6) | 1041 (80) |
Unknown | 0 (0) | 2 (0.2) |
Second-hand smoking: Relatives | ||
Yes | 286 (21.9) | 333 (25.6) |
No | 1015 (78) | 966 (74.2) |
Unknown | 1 (0.1) | 3 (0.2) |
History of hormone-replacement therapy | ||
Yes | 239 (18.4) | 230 (17.7) |
No | 982 (75.4) | 1018 (78.2) |
Unknown | 81 (6.2) | 54 (4.1) |
History of oral contraceptive use | ||
Yes | 95 (7.3) | 113 (8.7) |
No | 1142 (87.7) | 1116 (85.7) |
Unknown | 65 (5) | 73 (5.6) |
Homemaker | ||
Yes | 136 (10.4) | 91(7.0) |
No | 1,147 (88.1) | 1,206 (92.6) |
Unknown | 19 (1.5) | 5 (0.4) |
Chef | ||
Yes | 82 (6.3) | 84 (6.2) |
No | 1,220 (93.7) | 1,217 (93.7) |
Unknown | 0 (0) | 1 (0.1) |
Exposure to COFs (cooking time-years >10) | ||
Yes | 1069 (82.1) | 1135 (87.2) |
No | 204 (15.7) | 153 (11.8) |
Unknown | 29 (2.2) | 14 (1.1) |
