Variable | Primary/secondary outcome | Method of measurement |
---|---|---|
Sodium intake | Primary | 24-hour urinary sodium excretion |
Blood pressure | Primary | Validated, automated wrist BP monitorātriplicate measure |
Potassium intake | Secondary | 24-hour urinary potassium excretion |
Iodine status | Secondary | Urine iodine concentration |
Cigarette smoke exposure | Secondary | Urine cotinine concentration and questionnaire |
Medication use | Secondary | Questionnaire |
Dietary salt behaviour | Secondary | Questionnaire* |
Alcohol consumption | Secondary | Questionnaire |
Physical activity | Secondary | Global Physical Activity Questionnaire44 |
Body composition | Secondary | Height, weight, waist and hip circumference |
Quality of life | Secondary | WHO 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.