Research Article
Association of Polymorphisms in X-Ray Repair Cross Complementing 1 Gene and Risk of Esophageal Squamous Cell Carcinoma in a Chinese Population
Table 2
Characteristics of esophageal cancer cases and controls.
| Variables | Case N (%)
| Control N (%)
| | P |
| Age | | | | | ≤65 | 237 (62.2) | 286 (66.2) | 1.41 | 0.23 | >65 | 144 (37.8) | 146 (33.8) | Gender | | | | | Male | 256 (67.2) | 278 (64.4) | 0.72 | 0.40 | Female | 125 (32.8) | 154 (35.6) | Smoking* | | | | | Nonsmokers | 189 (59.6) | 264 (61.1) | 0.17 | 0.68 | Smokers | 128 (40.4) | 168 (38.9) | Drinking* | | | | | Nondrinkers | 255 (80.7) | 353 (81.9) | 0.18 | 0.68 | Drinkers | 61 (19.3) | 78 (18.1) | Family history of cancer* | | | | | No | 233 (75.6) | 357 (85.2) | 10.60 | 0.001 | Yes | 75 (24.4) | 62 (14.8) |
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because of the failure data collection, the number of cases and controls for some factors was less than 381 or 432.
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