Table 2 Crude and age-adjusted prevalence of refractive error
| Â | N | Crude rate | Age-adjusted rate | 95%CI lower | 95%CI upper | P value |
|---|---|---|---|---|---|---|
Myopia | ||||||
Total | 373 | 29.96% | 28.56% | 25.77% | 31.35% | <0.001 |
 Han | 274 | 35.63% | 32.93% | 29.28% | 36.58% |  |
 Tibetan | 99 | 20.80% | 21.64% | 17.46% | 25.82% |  |
Hyperopia | ||||||
Total | 228 | 18.31% | 22.82% | 20.13% | 25.52% | Â |
 Han | 136 | 17.69% | 23.04% | 19.57% | 26.51% | 0.313 |
 Tibetan | 92 | 19.33% | 22.48% | 18.20% | 26.75% |  |
High myopia | ||||||
Total | 42 | 3.37% | 2.80% | 1.85% | 3.74% | Â |
 Han | 36 | 4.68% | 3.93% | 2.51% | 5.35% | 0.001 |
 Tibetan | 6 | 1.26% | 1.02% | 0.06% | 1.98% |  |
Astigmatism | ||||||
Total | 803 | 64.50% | 69.38% | 66.71% | 72.06% | Â |
 Han | 515 | 66.97% | 72.14% | 68.87% | 75.40% | 0.021 |
 Tibetan | 288 | 60.50% | 64.94% | 60.38% | 69.49% |  |