Table 1. General characteristics of the case and control group.
| Case group(n=200) | Control group(n=200) | χ2/t | P | |
|---|---|---|---|---|
| Age (±s) | 59.56±10.56 | 53.70±13.34 | 4.872 | <0.001 |
| Male (n) | 143 | 151 | 0.821 | 0.428 |
| Smokin (n) | 107 | 79 | 7.879 | 0.007 |
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