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Table 1 Characteristics of Han and Tibetan participants

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

  Han n = 769 % Tibetan n = 476 % P value
Sex      0.035
Male 376 48.89 262 55.04  
Female 393 51.11 214 44.96  
Age (y)      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   163.00   0.205
Weight (kg) 63.99   68.34   <0.001
BMI (kg/m2) 24.22   25.62   < 0.001
Current Residence      <0.001
Urban 528 68.66 200 42.02  
Rural 241 31.34 276 57.98  
Birth Place      <0.001
Urban 167 21.72 28 5.88  
Rural 602 78.28 448 94.12  
Time spent in rural areas (y) 33.48   47.48   <0.001
Education      <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      <0.001
Non-close 420 54.62 361 75.84  
Close 349 45.38 115 24.16  
Income (¥)      <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      0.127
Never 471 61.25 312 65.55  
Past/current 298 38.75 164 34.45  
Drinking      <0.001
Never 360 46.81 291 61.13  
Past/current 409 53.19 185 38.87  
Active level      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