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Table 2 Crude and age-adjusted prevalence of refractive error

From: Prevalence and risk factors of refractive error in Qinghai, China: a cross-sectional study in Han and Tibetan adults in Xining and surrounding areas

  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%  
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%  
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%  
Han 515 66.97% 72.14% 68.87% 75.40% 0.021
Tibetan 288 60.50% 64.94% 60.38% 69.49%