Zhanjiang (Southern China) | Cases (n = 273) | Control (n = 280) | P |
---|---|---|---|
Age, years, mean ± SD | 62.9 ± 18.5 | 62.0 ± 14.7 | 0.661 |
Gender, male/female, number | 200/73 | 213/67 | 0.447 |
Harbin (Northern China) | Cases (n = 167) | Controls (n = 170) | Â |
Age, years, mean ± SD | 58.4 ± 21.2 | 62.2 ± 11.4 | 0.551 |
Gender, male/female, number | 90/77 | 85/85 | 0.475 |
All subjects | Cases (n = 440) | Controls (n = 450) | Â |
Age, years, mean ± SD | 61.3 ± 19.9 | 62.1 ± 13.5 | 0.631 |
Gender, male/female, number | 290/150 | 298/152 | 0.921 |