Table 2 Demographics and pathologies of case and control groups, n (%)
Case group | Control group | χ2 | p | |
|---|---|---|---|---|
Age, years | ||||
≤ 50 | 237 (41.5) | 276 (45.3) | 2.847 | 0.241 |
51–54 | 138 (24.2) | 151 (24.8) | ||
55–59 | 196 (34.3) | 182 (29.9) | ||
Gender | ||||
Male | 364 (63.7) | 397 (65.2) | 0.267 | 0.626 |
Female | 207 (36.3) | 212 (34.8) | ||
Education | ||||
Elementary school or less | 278 (48.7) | 208 (34.2) | 27.815 | < 0.001 |
Middle school | 246 (43.1) | 319 (52.4) | ||
College and above | 47 (8.2) | 82 (13.5) | ||
Marital status | ||||
Married | 550 (96.3) | 575 (94.4) | 2.407 | 0.130 |
Unmarried and other | 21 (3.7) | 34 (5.6) | ||
Pathology | ||||
Adenocarcinoma | 285 (49.9) | – | ||
Squamous cell carcinoma | 140 (24.5) | – | ||
Alveolar cell carcinoma | 39 (3.3) | – | ||
Small cell carcinoma | 47 (8.2) | – | ||
Large cell carcinoma | 14 (2.5) | – | ||
Undifferentiated carcinoma | 16 (2.8) | – | ||
Others | 30 (5.3) | – | ||