Supplementary Table 1. Characteristics of Study Population (n=715554).
| n | % | |
|---|---|---|
| Cataract | ||
| No | 695152 | 88.7 |
| Yes | 88464 | 11.3 |
| Sociodemographic factors | ||
| Age (yrs) | ||
| 40-49 | 207293 | 29.0 |
| 50-59 | 192903 | 27.0 |
| 60-69 | 160605 | 22.4 |
| 70-79 | 120905 | 16.9 |
| 80+ | 33848 | 4.7 |
| Sex | ||
| Male | 327000 | 45.7 |
| Female | 388554 | 54.3 |
| Monthly household income (≒USD)* | ||
| Lowest quintile (<500) | 137527 | 19.2 |
| 2nd-4th quintile (500-2000) | 426393 | 59.6 |
| Highest quintile (>2000) | 151634 | 21.2 |
| Education | ||
| Elementary school | 186931 | 29.5 |
| Middle school | 116857 | 18.4 |
| High school | 208528 | 32.9 |
| University or higher | 122352 | 19.3 |
| Residential area† | ||
| Urban | 357519 | 50.0 |
| Rural | 358035 | 50.0 |
| Medicaid | ||
| No | 674762 | 94.3 |
| Yes | 40615 | 5.7 |
| Spouse | ||
| With spouse | 544931 | 78.0 |
| Without spouse | 153538 | 22.0 |
| Occupation | ||
| Administrative, management, or professional occupations | 55342 | 7.9 |
| Business and financial operation occupations | 33315 | 4.7 |
| Sales and related occupations | 87272 | 12.4 |
| Farming, fishing, and forestry occupations | 124456 | 17.6 |
| Installation, maintenance, and repair occupations/laborers | 131379 | 18.6 |
| Housewives | 148504 | 21.1 |
| Others, including unemployed | 125145 | 17.7 |
| Obesity (BMI)‡ | ||
| 1st quintile (<20.20) | 143159 | 20.0 |
| 2nd quintile (20.20-21.93) | 143417 | 20.0 |
| 3rd quintile (21.93-23.39) | 142873 | 20.0 |
| 4th quintile (23.39-25.16) | 144464 | 20.2 |
| 5th quintile (>25.16) | 141641 | 19.8 |
| Comorbidities | ||
| Hypertension | ||
| No | 508183 | 71.0 |
| Yes | 207128 | 29.0 |
| Diabetes mellitus | ||
| No | 637903 | 89.2 |
| Yes | 77397 | 10.8 |
| Dyslipidemia | ||
| No | 655021 | 91.5 |
| Yes | 60533 | 8.5 |
| Cerebrovascular accident | ||
| No | 695742 | 97.3 |
| Yes | 19626 | 2.7 |
| Myocardial infarction | ||
| No | 702444 | 98.2 |
| Yes | 12536 | 1.8 |
| Angina | ||
| No | 698441 | 97.7 |
| Yes | 16515 | 2.3 |
| Arthritis | ||
| No | 591879 | 82.7 |
| Yes | 123675 | 17.3 |
| Osteoporosis | ||
| No | 642225 | 89.8 |
| Yes | 72679 | 10.2 |
| Asthma | ||
| No | 693321 | 96.9 |
| Yes | 22059 | 3.1 |
| Allergic rhinitis | ||
| No | 668363 | 93.4 |
| Yes | 46921 | 6.6 |
| Atopic dermatitis | ||
| No | 705151 | 98.6 |
| Yes | 10217 | 1.4 |
| Hepatitis B infection | ||
| No | 699696 | 97.8 |
| Yes | 15355 | 2.2 |
| Health behaviors | ||
| Lifetime smoker§ | ||
| No | 440234 | 61.5 |
| Yes | 275320 | 38.5 |
| Lifetime alcohol user∥ | ||
| No | 203893 | 28.5 |
| Yes | 511577 | 71.5 |
| Physical activity¶ | ||
| Regular physical activity | 152525 | 21.3 |
| No regular physical activity | 563029 | 78.7 |
| Salt intake | ||
| High | 185665 | 26.0 |
| Normal | 365126 | 51.0 |
| Low | 164637 | 23.0 |
| Sleep duration | ||
| <6 hrs/day | 121100 | 16.9 |
| 6-9 hrs/day | 579158 | 81.0 |
| >9 hrs/day | 14994 | 2.1 |
BMI, body mass index.
*The income per adult equivalent was calculated using the following formula: household income/√number of people in household, †Residence was classified as either belonging to a metropolitan area or not depending on whether the administrative district had a population of 20000 or greater, ‡BMI was calculated using the equation: body weight (kg)/height (m2), §All respondents were asked if they had smoked a total of 100 cigarettes in their life.2 Those who answered 'yes' and still smoked were classified as 'lifetime smokers,' ∥Lifetime alcohol users were defined as those who have ever drunk alcohol in their life, ¶We defined moderate-intensity activities as those that lasted at least 30 minutes and increased the individual's heart rate slightly compared to sedentary activities; examples included volleyball, table tennis, swimming, yoga, and badminton, but not walking.