Table 2.

Crude and age-adjusted prevalence of refractive error

	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%