Table 1 General characteristics of the study group
Variables | Patients n = 246 (%) | Controls n = 250 (%) | p value |
|---|---|---|---|
Gender | |||
 Male | 177 (71.95) | 180 (73.91) | 0.99 |
 Female | 69 (28.05) | 70 (26.09) | 0.99 |
Age | |||
 Mean ± (SD) | 57.57 ± 10.19 | 58.06 ± 9.56 |  |
Stages of NSCLC | |||
 II | 28 (7.66) |  |  |
 III | 82 (34.23) |  |  |
 IV | 136 (58.11) |  |  |
Histology | |||
 Squamous-cell carcinoma | 97 (43.24) |  |  |
 Adenocarcinoma | 109 (48.65) |  |  |
 Large cell and others | 40 (8.11) |  |  |
Alcoholism | |||
 Consumers | 95 (38.62)* | 26 (10.4) | 0.01 |
 Non-consumers | 151 (61.38)* | 224 (89.6) | 0.01 |
Smoking status | |||
 Never-smokers | 98 (39.84)* | 175 (69.08) | <0.001 |
 Ex-smokers | 42 (17.07)* | 12 (4.35) | <0.001 |
 Current smokers | 106 (43.08) * | 63 (26.57) | <0.001 |
 ≤20 pack years | 38 (15.45) | 28 (11.2) | 0.16 |
 21–40 pack years | 34 (13.82)* | 18 (7.2) | 0.01 |
 41–60 pack years | 8 (3.25) | 5 (18.85) | 0.38 |
 >60 pack years | 26 (10.57)* | 12 (7.72) | 0.01 |
 Passive smokers | 38 (15.45)* | 5 (2) | <0.001 |