Table 1 Demographic features and geographic origins of 1012 patients enrolled in the study
Characteristic | Patients |
|---|---|
Gender, n (%) | |
Male | 506 (50.0) |
Female | 506 (50.0) |
Age, years | |
Median (range) | 46 (12–99) |
Mean ± SD | 48.8 ± 14.7 |
Geographic origin, n (%) | |
Northeastern China | 111 (10.97) |
Northern China | 403 (39.82) |
Central China | 40 (3.95) |
Eastern China | 275 (27.17) |
Southern China | 59 (5.83) |
Western China | 124 (12.25) |