| Han n = 769 | % | Tibetan n = 476 | % | P value |
---|---|---|---|---|---|
Sex | Â | Â | Â | Â | 0.035 |
 Male | 376 | 48.89 | 262 | 55.04 |  |
 Female | 393 | 51.11 | 214 | 44.96 |  |
Age (y) | Â | Â | Â | Â | 0.658 |
 50–54 | 359 | 46.68 | 207 | 43.49 |  |
 55–59 | 145 | 18.86 | 96 | 20.17 |  |
 60–65 | 136 | 17.69 | 94 | 19.75 |  |
 65+ | 129 | 16.78 | 79 | 16.60 |  |
Height (cm) | 162.37 | Â | 163.00 | Â | 0.205 |
Weight (kg) | 63.99 | Â | 68.34 | Â | <0.001 |
BMI (kg/m2) | 24.22 |  | 25.62 |  | < 0.001 |
Current Residence | Â | Â | Â | Â | <0.001 |
 Urban | 528 | 68.66 | 200 | 42.02 |  |
 Rural | 241 | 31.34 | 276 | 57.98 |  |
Birth Place | Â | Â | Â | Â | <0.001 |
 Urban | 167 | 21.72 | 28 | 5.88 |  |
 Rural | 602 | 78.28 | 448 | 94.12 |  |
Time spent in rural areas (y) | 33.48 | Â | 47.48 | Â | <0.001 |
Education | Â | Â | Â | Â | <0.001 |
 Primary school or lower | 327 | 42.52 | 355 | 74.58 |  |
 Middle/high school | 292 | 37.97 | 74 | 15.55 |  |
 Undergraduate/graduate | 150 | 19.51 | 47 | 9.87 |  |
Occupation | Â | Â | Â | Â | <0.001 |
 Non-close | 420 | 54.62 | 361 | 75.84 |  |
 Close | 349 | 45.38 | 115 | 24.16 |  |
Income (Â¥) | Â | Â | Â | Â | <0.001 |
  < 800/month | 273 | 35.50 | 285 | 59.87 |  |
 800–2000/month | 165 | 21.46 | 88 | 18.49 |  |
  > 2000/month | 331 | 43.04 | 103 | 21.64 |  |
Hypertension | 315 | 40.96 | 170 | 35.71 | 0.065 |
Diabetes | 101 | 13.13 | 41 | 8.61 | 0.015 |
Smoking | Â | Â | Â | Â | 0.127 |
 Never | 471 | 61.25 | 312 | 65.55 |  |
 Past/current | 298 | 38.75 | 164 | 34.45 |  |
Drinking | Â | Â | Â | Â | <0.001 |
 Never | 360 | 46.81 | 291 | 61.13 |  |
 Past/current | 409 | 53.19 | 185 | 38.87 |  |
Active level | Â | Â | Â | Â | 0.006 |
 Light | 86 | 11.18 | 82 | 17.23 |  |
 Moderate | 568 | 73.86 | 337 | 70.80 |  |
 Heavy | 115 | 14.95 | 57 | 11.97 |  |
Pterygium | 59 | 7.67 | 43 | 9.03 | 0.395 |