Characteristic of study subjects by examination status and minority, N (%)
| Enumerated | Examined | |
| Ethnicity | ||
| Tibetan | 4323 (86.5) | 4127 (95.5) |
| Han | 523 (10.5) | 495 (94.7) |
| Other | 154 (3.08) | 142 (92.2) |
| Age | ||
| 50–59 years | 1896 (37.9) | 1831 (96.6) |
| 60–69 years | 1662 (33.2) | 1582 (95.2) |
| 70–79 years | 1091 (21.8) | 1038 (95.1) |
| 80+years | 351 (7.02) | 313 (89.2) |
| Sex | ||
| Male | 2177 (43.5) | 2087 (95.9) |
| Female | 2823 (56.5) | 2677 (94.8) |
| Region | ||
| Pastoral area | 1173 (23.5) | 1105 (94.2) |
| Agriculture area | 3602 (72.0) | 3440 (95.5) |
| Urban | 225 (4.50) | 219 (97.3) |
| Distance from hospital, km | ||
| ≤200 | 1600 (32.0) | 1515 (94.7) |
| 201–400 | 1500 (30.0) | 1437 (95.8) |
| >400 | 1900 (38.0) | 1812 (95.4) |
| Altitude of participants lived, metres | ||
| ≤2000 | 500 (10.0) | 476 (95.2) |
| 2001–3000 | 1450 (29.0) | 1371 (94.6) |
| 3001–4000 | 2550 (51.0) | 2448 (96.0) |
| >4000 | 500 (10.0) | 469 (93.8) |
| Total | 5000 (100.0) | 4764 (95.3) |