Table 1 General characteristics of the study population
| Â | Number | Percent |
|---|---|---|
Age | ||
 20–29 | 49,609 | 9.8 |
 30–39 | 112,854 | 22.3 |
 40–49 | 131,077 | 25.9 |
 50–59 | 131,556 | 26.0 |
 60–64 | 80,595 | 15.9 |
Sex | ||
 Men | 230,371 | 45.6 |
 Women | 275,320 | 54.4 |
Income | ||
 Low (0–20%) | 70,648 | 14.0 |
 Middle (20.1–80%) | 302,061 | 59.7 |
 High (80.1–100%) | 132,982 | 26.3 |
Region | ||
 Urban | 359,964 | 71.2 |
 Rural | 145,727 | 28.8 |
Charlson comorbidity index | ||
 0 | 325,786 | 64.4 |
 1 | 126,791 | 25.1 |
 2 | 41,673 | 8.2 |
 3+ | 11,441 | 2.3 |
Disability | ||
 Normal | 487,371 | 96.4 |
 Mild disability | 15,519 | 3.1 |
 Severe disability | 2,801 | 0.6 |
All cause admission at previous year | ||
 Non-admission | 456,769 | 90.3 |
 Admission | 48,922 | 9.7 |
Most frequent disease (ICD-10 code) | ||
 Acute bronchitis, unspecified (J20.9) | 335,686 | 66.4 |
 Acute tonsillitis (J03.0 ~ J03.9) | 201,650 | 39.9 |
 Gastritis and duodenitis (K29.0 ~ K29.9) | 192,444 | 38.1 |
 Acute upper respiratory infections of multiple and unspecified sites (J06.0 ~ J06.9) | 173,381 | 34.3 |
 Allergic contact dermatitis due to other agents or unspecified cause (L23.8, L23.9) | 140,817 | 27.8 |
Total | 505,691 | 100.0 |