TableĀ 1

Primary and secondary outcome measures

VariablePrimary/secondary outcomeMethod of measurement
Sodium intakePrimary24-hour urinary sodium excretion
Blood pressurePrimaryValidated, automated wrist BP monitorā€”triplicate measure
Potassium intakeSecondary24-hour urinary potassium excretion
Iodine statusSecondaryUrine iodine concentration
Cigarette smoke exposureSecondaryUrine cotinine concentration and questionnaire
Medication useSecondaryQuestionnaire
Dietary salt behaviourSecondaryQuestionnaire*
Alcohol consumptionSecondaryQuestionnaire
Physical activitySecondaryGlobal Physical Activity Questionnaire44
Body compositionSecondaryHeight, weight, waist and hip circumference
Quality of lifeSecondaryWHO Quality of Life instrument (WHOQoL)45
  • *The dietary salt questionnaire consists of the following questions: (1) Do you add salt to food at the table? (Always, rarely, sometimes, often, never); (2) In the food you eat at home, salt is added in cooking [always, rarely, sometimes, often, never); (3) How much salt do you think you consume? (Far too much, too much, just the right amount, too little, far too little, don't know, refused); (4) Do you think a high salt diet could cause a serious health problem? (Yes, no, don't know, refused); (5) Do you do anything on a regular basis to control your salt or sodium intake? (Yes, no, don't know, refused).

  • BP, blood pressure; WHOQoL, WHO Quality of Life instrument.