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Table 4 Confounder measurements

From: Reducing salt intake for prevention of cardiovascular diseases in high-risk patients by advanced health education intervention (RESIP-CVD study), Northern Thailand: study protocol for a cluster randomized trial

Confounder

Variables

How to measure

Demographic characteristics

Age, sex, social status, family size, educational attainment, occupational history, income

Questionnaire

Lifestyle

Smoking, alcohol

Questionnaire

Genetic factor

Family history of diabetes/hypertension

Questionnaire

Drugs

Different medications for diabetes and hypertension

Clinical record