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Characteristics of cases and controls.
| Variable | Case | Control | p | ||
|---|---|---|---|---|---|
| (n = 476) | (n = 481) | ||||
| Age, mean years (SD) | 57.1 | (11.5) | 56.4 | (11.8) | 0.334 a |
| Gender, n (%) | |||||
| Male | 249 | (52.3) | 247 | (51.4) | 0.766 b |
| Female | 227 | (47.7) | 234 | (48.6) | |
a p values were calculated by Student’s t test; b p values were calculated by two-sided χ2 test.
