Table 4 Assignment of independent variable

Sex

Male = 1; Female = 2

Age

 ≤ 20 = 000; 21–40 = 001; 41–60 = 010; ≥ 61 = 100

Education background

Primary school or below = 000; Junior high school = 001; Senior high school = 010; Bachelor degree or above = 100

Marital status

Unmarried = 00; Married = 01; Divorce or bereavement = 10

Living conditions

Live alone = 000; Live with spouse = 001; Live with children = 010; Other = 100

Duration of diabetes

 ≤ 3 = 000; 4–5 = 001; 6–10 = 010; ≥ 11 = 100

Monthly income per capita in family

 ≤ 3000 = 00; 3001–5000 = 01; ≥ 5001 = 10

Frequency of weekly exercise

No exercise = 000; 1–2 times / week = 001; 3–5 times / week = 010; Exercise every day = 100

Frequency of hypoglycemia

1–2 times / 6 months = 00; 3–6 times / 6 months = 01; More than 6 times / 6 months = 10