Table 1.
Characteristics of the 103 lung cancer patients and 265 controls.
| Cases, N (%) | Controls, N | p value | |
|---|---|---|---|
| Smoking status | < 0.001 ξ | ||
| Never | 6 (5.8) | 69 (26.1) | |
| Former | 36 (34.9) | 128 (48.2) | |
| Current | 61 (59.2) | 68 (25.7) | |
| Pack-years (PY) | 61.2 ± 28.5 | 29.9 ± 21.4 | < 0.001 ‡ |
| Current and Former Smoking | < 0.001 ξ | ||
| Moderate (≤50 PY) | 30 (29.1) | 137 (51.8) | |
| Heavy (>50 PY) | 67 (65) | 59 (22.1) | |
| Family history of tumours | < 0.001 ξ | ||
| Yes | 47 (45.6) | 66 (24.9) | |
| No | 56 (54.4) | 199 (75.1) | |
| Histological tumour type | |||
| Squamous cell carcinoma | 49 (47.6) | ||
| Large cell carcinoma | 23 (22.3) | ||
| Adenocarcinoma | 16 (15.5) | ||
| Small cell carcinoma | 15 (14.6) |
* Plus-minus values are means ± standard deviation. Because of rounding, percentages may not total 100.
‡ Student's t test.
ξ Pearson's χ2 analysis.
γFirst-degree family.