Table 1.
Descriptive characteristics of the study population by case-control status (N=1995)1
| Characteristic | Cases (N = 660) N (SD or %) |
Controls (N = 1335) N (SD or %) |
p-value2 |
|---|---|---|---|
| Age (Continuous) | 63.42 (9.96) | 63.40 (10.20) | 0.969 |
| Sex | <0.001 | ||
| Male | 379 (57.42%) | 579 (43.40%) | |
| Female | 281 (42.58%) | 755 (56.60%) | |
| Family History of Lung Cancer | 0.002 | ||
| Yes | 87 (14.90%) | 120 (9.95%) | |
| No | 497 (85.10%) | 1086 (90.05%) | |
| BMI (kg/m2) | 25.63 (4.42) | 26.58 (5.16) | <0.001 |
| BMI Classification | 0.005 | ||
| Underweight | 16 (2.45%) | 18 (1.36%) | |
| Normal | 289 (44.33%) | 538 (40.79%) | |
| Overweight | 261 (40.03%) | 513 (38.89%) | |
| Obese | 86 (13.19%) | 250 (18.95%) | |
| Recreational Inactivity | <0.001 | ||
| Active | 209 (31.67%) | 674 (50.49%) | |
| Inactive | 451 (68.33%) | 661 (49.51%) | |
| Smoking (Pack Years) | <0.001 | ||
| 0 | 35 (5.34%) | 552 (41.47%) | |
| >0–31 | 23 (3.51% | 93 (6.99%) | |
| >31–46 | 30 (4.57%) | 38 (2.85%) | |
| >46–64 | 31 (4.73%) | 59 (4.43%) | |
| >64 | 537 (81.86%) | 589 (44.25%) | |
| Smoking Status (3 levels)3 | <0.001 | ||
| Never-smoker | 39 (5.91%) | 551 (41.27%) | |
| Former-smoker | 486 (73.64%) | 608 (45.54%) | |
| Current Smoker | 135 (20.45%) | 176 (13.18%) | |
| Smoking Status (2 levels)4 | <0.001 | ||
| Current Smoker | 135 (25.14%) | 176 (13.72%) | |
| Non-Smoker | 402 (74.86%) | 1107 (86.28%) |
1
Numbers may not sum to total due to missing data
2
p-value represents Chi square test for independence for categorical variables and t-test for continuous variables
3
Former smokers included all participants who reported quitting smoking prior to study enrollment; Current smokers were actively smoking at the time of study enrollment.
4
Current smokers were actively smoking at the time of study enrollment; non-smokers included only those who were never-smokers and those who had quit smoking at least one year prior to study enrollment.