Table 1.
Baseline demographic information of the study population
| Demographic information | Overall | Case | Control |
|---|---|---|---|
| (N = 30,060) | (n = 17,166) | (n = 12,894) | |
| Gender | |||
| Female (n, %) | 11,417 (38.0) | 6785 (37.4) | 4962 (38.5) |
| Male (n, %) | 18,643 (62.0) | 10,711 (62.4) | 7932 (61.5) |
| Age, mean (SD) | 62.9 (10.6) | 63.7 (10.7) | 62.0 (10.6) |
| Histology | |||
| NSCLC (n, %) | 13,116 (76.4) | 13,116 (76.4) | - |
| ADC (n, %) | 6539 (38.1) | 6539 (38.1) | - |
| SCC (n, %) | 4180 (24.4) | 4180 (24.4) | - |
| Others (n, %) | 2397 (14.0) | 2397 (14.0) | - |
| SCLC (n, %) | 1763 (10.3) | 1763 (10.3) | - |
| Others (n, %) | 2287 (13.3) | 2287 (13.3) | - |
| Smoking information | |||
| Never smoker (n, %) | 5805 (19.3) | 1702 (9.9) | 4103 (31.8) |
| Former smoker (n, %) | 11,497 (38.2) | 6683 (38.9) | 4814 (37.3) |
| Current smoker (n, %) | 12,758 (42.4) | 8781 (51.2) | 3977 (30.8) |
| Pack-years, median (range) | 29.4 (0.0, 315.0) | 39.0 (0.0, 315.0) | 13.0 (0.0, 260.0) |
SD standard deviation; NSCLC non-small cell lung cancer; ADC adenocarcinoma, SCC squamous cell carcinoma; SCLC small cell lung cancer