Table 1.
Distribution of selected variables among cases and controls
| Variables | Case (%) | Control (%) | P value | OR (95% CI) |
|---|---|---|---|---|
| (n = 1166) | (n = 1179) | |||
| Age (yrs.) mean ± SD | 58.28 ± 11.28 | 59.19 ± 10.78 | 0.149 | |
| < 50 | 223(19.1) | 264(22.4) | 1 | |
| 51–69 | 739(63.4) | 716(60.7) | 1.222 (0.995–1.501) | |
| ≥ 70 | 204(17.5) | 199(16.9) | 1.214 (0.932–1.581) | |
| Income(yuan/month) | ||||
| ≤ 3500 | 797 (67.6) | 836 (71.7) | 0.031 | 1 |
| > 3500 | 382 (32.4) | 330 (28.3) | 0.824 (0.690–0.982) | |
| Gender | 0.542 | |||
| Male | 842 (72.2) | 838 (71.1) | 1 | |
| Female | 324 (27.8) | 341 (28.9) | 0.946 (0.790–1.132) | |
| Education | < 0.001 | |||
| Illiteracy | 185(15.9) | 133(11.3) | 1 | |
| Middle school and below | 686(58.8) | 647(54.9) | 0.762 (0.595–0.976) | |
| High school and above | 295(25.3) | 399(33.8) | 0.532 (0.406–0.696) | |
| Marital status | 0.15 | |||
| Married | 1099(94.3) | 1094(92.8) | 1 | |
| Single | 67(5.7) | 85(7.2) | 0.785(0.564–1.092) | |
| Occupation | < 0.001 | |||
| Worker | 266(22.8) | 297(25.2) | 1 | |
| Farmer | 333(28.6) | 245(20.8) | 1.518 (1.201–1.917) | |
| Enterprises and employees | 321(27.5) | 433(36.7) | 0.828 (0.665–1.031) | |
| Cook | 18(1.5) | 9(0.8) | 2.233 (0.986–5.055) | |
| Others | 228(19.6) | 195(16.5) | 1.305 (1.014–1.681) | |
| Family history of lung cancer | 0.004 | |||
| No | 942(80.8) | 1005(85.2) | 1 | |
| Yes | 224(19.2) | 174(14.6) | 1.373(1.105–1.706) | |
| History of lung diseases | < 0.001 | |||
| No | 1009(86.5) | 1080(91.6) | 1 | |
| Yes | 157(13.5) | 99(8.4) | 1.697(1.301–2.214) | |
| BMI (kg/m2) | < 0.001 | |||
| 18.5–23.9 | 720(61.9) | 638(54.5) | 1 | |
| < 18.5 | 133(11.4) | 51(4.4) | 2.311(1.645–3.246) | |
| ≥ 24 | 311(26.7) | 481(41.1) | 0.573(0.479–0.685) | |
| Tea | 0.729 | |||
| No | 578(49.6) | 576(48.9) | 1 | |
| Yes | 588(50.4) | 603(51.1) | 0.972(0.826–1.143) | |
| Alcohol | 0.353 | |||
| No | 884(75.8) | 913(77.4) | 1 | |
| Yes | 282(24.2) | 266(22.6) | 1.095(0.904–1.326) | |
| Smoking | < 0.001 | |||
| No | 427(36.6) | 691(58.6) | 1 | |
| Yes | 739(63.4) | 488(41.4) | 2.451(2.075–2.894) | |
| ETS | < 0.001 | |||
| No | 348(29.8) | 647(54.9) | 1 | |
| Yes | 818(70.2) | 532(45.1) | 2.859(2.412–3.388) | |
| Histology | ||||
| Adenocarcinoma | 551(47.3) | |||
| Squamous cell carcinoma | 324(27.8) | |||
| Others | 290(24.9) | |||