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Table 1 Independent variables and their coding

From: Prevalence, awareness, treatment, and control of hypertension in Northern China: a cross-sectional study

Variable

Categories

Sex

Male = 1 (reference), female = 2

Location of residence

Rural = 1 (reference), urban = 2

Marital status

Not married = 1 (reference), married = 2

Farmer

No = 1 (reference), yes = 2

Health insurance

No = 1 (reference), yes = 2

Diabetes

No = 1 (reference), yes = 2

Obesity

No = 1 (reference), yes = 2

Dyslipidemia

No = 1 (reference), yes = 2

Current smoker

No = 1 (reference), yes = 2

Current Drinker

No = 1 (reference), yes = 2

Prior CVD

No = 1 (reference), yes = 2

Prior CHD

No = 1 (reference), yes = 2

Ethnicity

Han = 1 (reference), Mongol = 2, others = 3

Age (years)

35–44 = 1 (reference), 45–54 = 2, 55–64 = 3, 65–75 = 4

Annual household income (yuan)

Low (< 10,000) = 1 (reference), middle (10,000–50,000) = 2, high (> 50,000) = 3

Educational level

Low (primary school or lower) = 1 (reference), middle (middle school) = 2, high (high school) = 3