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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