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Demographic characteristics of the three groups.
| Penglai | Huzhu | Yushu | p Value | |
|---|---|---|---|---|
| Total | 697 | 122 | 73 | - |
| Gender | ||||
| Male (%) | 410 (58.8) | 81 (66.4) | 49 (67.1) | 0.140 |
| Female (%) | 287 (41.2) | 41 (33.6) | 24 (32.9) | |
| Age (years) | 69.14 ± 11.10 | 64.44 ± 11.50 | 64.45 ± 14.03 | <0.001 |
| Race | ||||
| Han (%) | 697 (100) | 105 (86.1) | 5 (6.8) | <0.001 |
| Tibetan (%) | 0 | 4 (3) | 67 (91.8) | <0.001 |
| Tu (%) | 0 | 13 (11) | 1 (1.4) | <0.001 |
