Table 1.

Definitions and coding schema for patients’ sociodemographic variables.

Variables	Definitions and coding schema
Age	< 55 = 1; 55- = 2; ≥ 65 = 3
Sex	Male = 1; Female = 2
Marital status	Was categorized as married/cohabiting and widowed/unmarried/divorce/separation married/cohabiting = 1; widowed/unmarried/divorce/separation = 2
Spouse	Was defined as whether a CHD patient was accompanied by a spouse, and was categorized as yes or no No = 0; Yes = 1
Educational level	Was categorized as illiterate, primary school, junior high school or above illiterate = 1; primary school = 2; junior high school and above = 3
Per capita monthly actual income	Was categorized as < 72$ (US dollars), 72 ~ 143$, and 143 ~ $  < 72 = 1; 72- = 2; ≥ 143 ~  = 3
Smoking status	Was defined as at least one cigarette per day for previous six months Never = 0; Current = 1; Former = 3
Drinking status	Was defined as 12 times alcohol consumption per year Never = 0; Current = 1; Former = 3
High-fat diet	Was defined as taking at least 75 g fat per day No = 0; Yes = 1
Vegetable and fruit diet	Was defined as taking at least 500 g vegetable or fruit per day No = 0; Yes = 1