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Table 1 Characteristics of the study population (N = 11,591)

From: Cataract subtype risk factors identified from the Korea National Health and Nutrition Examination survey 2008–2010

  n %
1. Socio-demographic factors   
Age (years)   
  40–49 3353 28.9
  50–59 3019 26.1
  60–69 2813 24.3
  70–80 1959 16.9
  80+ 447 3.9
Sex   
  Men 5000 43.1
  Women 6591 56.9
Monthly household income   
  Lowest quintile 3108 26.8
  2nd to 4th quintile 5946 51.3
  Highest quintile 2355 20.3
Education   
  Elementary school 4644 40.1
  Middle school 1779 15.4
  High school 3111 26.8
  University or higher 1929 16.6
Residential area   
  Urban 8124 70.1
  Rural 3467 29.9
Occupation   
Administrator, management, and professional 883 7.6
Business and financial operations 548 4.7
Sales and related 1416 12.2
Farming, fishing, and forestry 1539 13.3
Installation, maintenance, and repair 1089 9.4
Laborer 1208 10.4
Unemployed 4761 41.1
2. Health examination variable   
Obesity   
  Underweight 7223 62.3
  Normal 3980 34.3
  Obesity 357 3.1
Hypercholesterolemia   
  No 8978 77.5
  Yes 1695 14.6
Hypo-HDL-cholesterolemia   
  No 7613 65.7
  Yes 3122 26.9
Hypertriglycemia   
  No 7257 62.6
  Yes 1547 13.4
Anemia   
  No 9778 84.4
  Yes 1150 9.9
Metabolic syndrome   
  No 6782 58.5
  Yes 4809 41.5
3. Comorbidities   
Hypertension   
  No 8033 69.3
  Yes 3472 30.0
Diabetic mellitus   
  No 10237 88.3
  Yes 1267 10.9
Osteoarthritis   
  No 9596 82.8
  Yes 1907 16.5
Rheumatoid arthritis   
  No 11161 96.3
  Yes 342 3.0
Atopic dermatitis   
  No 11339 97.8
  Yes 163 1.4
Asthma   
  No 11083 95.6
  Yes 421 3.6
4. Health behavioral risk factors   
Lifetime smoker   
  No 6797 58.6
  Yes 4704 40.6
Binge alcohol user   
  No 8375 72.3
  Yes 3140 27.1
Physical activity of moderate intensity   
  never 11078 95.6
  more than once in a week 394 3.4
Coffee consumption   
  Never 1393 12.0
  1–6 cups per week 2236 19.3
  ≥7 cups per week 6476 55.9
Stress   
  Least stressful 2249 19.4
  Moderately stressful 8671 74.8
  Extremely stressful 557 4.8
Sun exposure   
  <5 hr/day 8182 70.6
  ≥5 hr/day 3286 28.4