Distributions of select characteristics by case-control status
| Variable . | Cases (n = 456) n (%) . | Controls (n = 451) n (%) . | P . |
|---|---|---|---|
| Gender | |||
| Male | 249 (54.61) | 248 (54.99) | |
| Female | 207 (45.39) | 203 (45.01) | 0.908 |
| Age (yrs), mean (SD) | 62.00 (9.30) | 62.12 (9.22) | 0.909 |
| Smoking status | |||
| Never | 46 (10.09) | 42 (9.31) | |
| Former | 234 (51.32) | 234 (51.89) | |
| Current | 176 (38.60) | 175 (38.80) | 0.925 |
| No. of cigarettes/day,a mean (SD) | 28.88 (13.05) | 28.96 (14.55) | 0.494 |
| Pack-years,a mean (SD) | 52.48 (30.29) | 50.49 (30.87) | 0.134 |
| Variable . | Cases (n = 456) n (%) . | Controls (n = 451) n (%) . | P . |
|---|---|---|---|
| Gender | |||
| Male | 249 (54.61) | 248 (54.99) | |
| Female | 207 (45.39) | 203 (45.01) | 0.908 |
| Age (yrs), mean (SD) | 62.00 (9.30) | 62.12 (9.22) | 0.909 |
| Smoking status | |||
| Never | 46 (10.09) | 42 (9.31) | |
| Former | 234 (51.32) | 234 (51.89) | |
| Current | 176 (38.60) | 175 (38.80) | 0.925 |
| No. of cigarettes/day,a mean (SD) | 28.88 (13.05) | 28.96 (14.55) | 0.494 |
| Pack-years,a mean (SD) | 52.48 (30.29) | 50.49 (30.87) | 0.134 |
Cigarettes/day and pack-years are for ever-smokers.