Table 1.
Demographic and clinical characteristics of patients
| Characteristic | No. of patients |
|---|---|
| Mean age at first diagnosis (range), y | 65.6 (38.8-79.7) |
| Sex | |
| Male | 134 |
| Female | 26 |
| Pathological subtype | |
| Adenocarcinoma | 100 |
| Squamous/Epidermoid carcinoma | 45 |
| Large cell carcinoma | 5 |
| Mixed type | 5 |
| Other non-small cells | 2 |
| Small cell carcinoma | 3 |
| Tumor stage | |
| IA | 40 |
| IB | 38 |
| IIA | 23 |
| IIB | 18 |
| IIIA | 35 |
| IIIB | 2 |
| IV | 4 |
| Chemotherapy | |
| Yes | 12 |
| No | 146 |
| Distant metastasis | |
| Yes | 84 |
| No | 74 |
| Death from any cause | 102 |
| Smoking status | |
| Never | 5 |
| Former | 73 |
| Current | 80 |
| Unknown | 2 |
| Cigarettes per day | |
| Mean (SD) | 22.5 (10.7) |
| ≤10 | 22 |
| >10 to ≤20 | 72 |
| >20 to ≤30 | 31 |
| >30 | 24 |
| Cigarette smoking duration, y | |
| Mean (SD) | 43.5 (10.6) |
| ≤30 | 13 |
| >30 to ≤40 | 47 |
| >40 to ≤50 | 48 |
| >50 | 41 |