Table 1.
The Distribution of Demographic and Major Risk Factors in Cases and Controls
| Lung Cancer | Controls | P | |
|---|---|---|---|
| Total Number | 680 (27.33) | 1808 (72.67) | |
| Mean(SD) | Mean(SD) | ||
| Age (continuous) | 66.79 (9.36) | 67.37 (9.32) | .1641 |
| N(column%) | N(column%) | ||
| Education | .1783 | ||
| Illiterate | 554 (81.71) | 1431 (79.50) | |
| Primary School | 106 (15.63) | 294 (16.33) | |
| Middle School + | 18 (2.65) | 75 (4.17) | |
| Income | .1783 | ||
| <1000 | 130 (19.88) | 416 (23.44) | |
| 1000–1499 | 131 (20.03) | 382 (21.52) | |
| 1500–2499 | 177 (27.06) | 459 (25.86) | |
| > = 2500 | 216 (33.03) | 518 (29.18) | |
| County | <.0001 | ||
| Dafeng | 152 (22.35) | 597 (33.02) | |
| Ganyu | 185 (27.21) | 337 (18.64) | |
| Chuzhou | 120 (17.65) | 365 (20.19) | |
| Tongshan | 223 (32.79) | 509 (28.15) | |
| Tobacco smoking | <.0001 | ||
| Ever | 181 (26.62) | 344 (19.03) | |
| Never | 499 (73.38) | 1464 (80.97) | |
| Pack-year | <.0001 | ||
| 0 | 499 (73.38) | 1464 (80.97) | |
| <10 | 25 (3.68) | 68 (3.76) | |
| [10,20) | 24 (3.53) | 63 (3.48) | |
| [20,30) | 51 (7.50) | 91 (5.03) | |
| [30,40) | 19 (2.79) | 45 (2.49) | |
| [40,50) | 25 (3.68) | 33 (1.83) | |
| [50,60) | 12 (1.76) | 24 (1.33) | |
| > = 60 | 25 (3.68) | 20 (1.11) | |
| BMI | <.0001 | ||
| <18.5 | 115 (17.09) | 155 (8.61) | |
| 18.5 to <24 | 388 (57.65) | 998 (55.41) | |
| 24 to <28 | 137 (20.36) | 497 (27.60) | |
| > = 28 | 33 (4.90) | 151 (8.38) | |
| Family history of lung cancer | .0117 | ||
| Yes | 25 (3.68) | 35 (1.94) | |
| No | 655 (96.32) | 1773 (98.06) |