Table 5 Assignment of demographic variables

Region

Western zone

Central province = 1; Eastern province = 2

Age

< 45

45–59 years = 1; 60–75 years = 2; > 75 years = 3

Insurance

Medical Insurance for Urban Employees

Medical Insurance for Urban Residents = 1; Basic Medical Insurance for Urban and Rural Residents = 2; New Rural Cooperative Medical Scheme = 3; Other = 4

Distance from the nearest health service institutions

< 1 km

1–3 km = 1; ≥ 4 km = 2

Course of disease

≤ 3 years

4–10 years = 1; 10–20 years = 2;

> 20 years = 3

Self-reported health status

Bad

Neither good nor bad = 1; Good = 2