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Summary of characteristics of study subjects.
| Cases (n = 485) | Controls (n = 516) | P a | |
|---|---|---|---|
| Age (years), mean ± S.D. | 61.23 ± 12.47 | 61.68 ± 11.81 | |
| Gender, n (%) | 0.1389 | ||
| Male | 357 (73.6) | 358 (69.4) | |
| Female | 128 (26.4) | 158 (30.6) | |
| Smoking status | 0.1613 | ||
| Nonsmoker | 297 (61.2) | 338 (65.5) | |
| Smoker | 188 (38.8) | 178 (34.5) | |
| Drinking status | 0.1686 | ||
| Nondrinker | 347 (71.5) | 389 (75.4) | |
| Drinker | 138 (28.5) | 127 (24.6) |
aCalculated by the Chi-squared test.
