| Cases | Controls | P |
---|---|---|---|
Number | 500 | 720 | Â |
Age, y (Mean ± SD) | 63.77 ± 9.576 | 71.82 ± 7.2 | 0.000# |
Sex, n (%) | Â | Â | 0.000* |
 Male | 147 (29.4) | 332 (46.1) |  |
 Female | 353 (70.6) | 388 (53.9) |  |
Ethnicity, n (%) | Â | Â | 0.761* |
 Han | 407 (81.4) | 591 (82.1) |  |
 Hui | 93 (18.6) | 129 (17.9) |  |