Table 2 Variable descriptions
From: Predicting high blood pressure using machine learning models in low- and middle-income countries
Variable name | Question | Variable type |
|---|---|---|
Demographic Information - Step 1 | ||
    sex | Sex (Record Male / Female as observed) | Category |
    age | How old are you? | Numeric |
    number of years at school | In total, how many years have you spent at school and in full- time study (excluding pre-school)? | Numeric |
    level of education | What is the highest level of education you have completed? | Category |
    marital status | What is your marital status? | Category |
    work status | Which of the following best describes your main work status over the past 12 months? | Category |
    number of people in household | How many people older than 18 years, including yourself, live in your household? | Numeric |
    earnings per year | Taking the past year, can you tell me what the average earnings of the household have been? | Numeric |
    currently smoking tobacco | Do you currently smoke tobacco products? | Category |
    age started smoking | How old were you when you first started smoking? | Numeric |
    length of time smoking | Length of time smoking | Numeric |
Behavioural Measurements - Step 1 | ||
    number of tobacco | On average, how many of the following products do you smoke each day? | Numeric |
    type of tobacco | What type of tobacco do you use? | Category |
    age stopped smoking | How old were you when you stopped smoking? | Numeric |
    smoking in the home or workplace | During the past 30 days, did someone smoke in your home or workplace? | Category |
    consume alcohol | Have you ever consumed any alcohol such as beer, wine, or spirits? | Category |
    quit drinking for health | Have you stopped drinking due to health reasons, such as a negative impact on your health or on the advice of your doctor or other health worker? | Category |
    number of alcoholic drinks | How many alcoholic drinks do you consume per day | Numeric |
    number daily fruit vegetables | How many fruit/ vegetables do you eat per day? | Numeric |
    salt consumption | How much salt or salty sauce do you think you consume? | Category |
    work intensity | How intense is your work? | Category |
    days vigorous exercise | In a typical week, on how many days do you do vigorous intensity activities as part of your work? | Numeric |
    days moderate exercise | In a typical week, on how many days do you do moderate intensity activities as part of your work? | Numeric |
    time walking bicycling minutes | How much time do you spend walking or bicycling for travel on a typical day? | Numeric |
    time sedentary | How much time do you usually spend sitting or reclining on a typical day? | Numeric |
    had blood pressure measurement | Have you ever had your blood pressure measured by a doctor or other health worker? | Category |
    taken drugs raised bp | Have you taken any drugs (medication) for raised blood pressure? | Category |
    blood sugar measurement | Have you ever had your blood sugar measured by a doctor or other health worker? | Category |
    taken diabetes drugs | Have you taken any drugs (medication) for diabetes? | Category |
    had cholesterol measurement | Have you ever had your cholesterol (fat levels in your blood) measured by a doctor or other health worker? | Category |
    taken cholesterol oral treatment | Have you taken any oral treatment (medication) for raised total cholesterol? | Category |
    had heart attack | Have you ever had a heart attack or chest pain from heart disease (angina) or a stroke (cerebrovascular accident or incident)? | Category |
    taking heart disease medication | Are you currently taking medication to prevent or treat heart disease? | Category |
    treated for raised bp | Have you been treated for raised blood pressure? | Category |
    are you pregnant | Are you pregnant? | Category |
Physical measurements - Step 2 | ||
    height | Height in cm | Numeric |
    weight | Weight in kg | Numeric |
    waist circumference | Waist circumference in cm | Numeric |
    hip circumference | Hip circumference in cm | Numeric |
    reading bpm | Average readings beats per minute | Numeric |
Biochemical measurements - Step 3 | ||
    fasting blood glucose | Fasting blood glucose (mg/dl) | Numeric |
    total cholesterol | Total Cholesterol (mg/dl) | Numeric |
    urinary sodium | Urinary sodium (mg/dl) | Numeric |
    urinary creatinine | Urinary creatinine (mg/dl) | Numeric |
    triglycerides | Triglycerides (mg/dl) | Numeric |
    hdl cholesterol | HDL Cholesterol (mg/dl) | Numeric |
    systolic | Average systolic (mmHG) | Numeric |
    diastolic | Average diastolic (mmHG) | Numeric |
Target variable | ||
    blood pressure | Blood pressure readings | Category |