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Table 1 Explanatory variables included in the stepwise selection algorithm for self-reported, doctor-diagnosed hypertension

From: National and subnational hypertension prevalence estimates for the Republic of Ireland: better outcome and risk factor data are needed to produce better prevalence estimates

Explanatory variable Categories
Sex Male
  Female
Age 18-34 years
  35-44 years
  45-54 years
  55-64 years
  65-74 years
  75+ years
Ethnicity White
  Non-white
Body mass index (BMI) Underweight/Normal (BMI < 25)
  Overweight (BMI 25-29.9)
  Obese (BMI 30+)
  Low
Physical activity (based on the International Physical Activity Questionnaire (IPAQ)) Moderate
  High
Cigarette smoking Never smoked
  Former smoker
  Current smoker
Alcohol consumption Never/monthly or less/2-4 times per month
  2-3 times per week
  4+ times per week
Fruit and vegetable consumption < 5 portions per day
  5+ portions per day
Salt use while cooking Always/usually, sometimes
  Sometimes
  Rarely/never
Salt use at the table Always/usually, sometimes
  Sometimes
  Rarely/never
Highest level of education Primary level
  Secondary level
  Third level
Employment status Employed
  Unemployed
  Economically inactive
Social class SC 1-2 (Professional and managerial)
  SC 3-4 (Non-manual and skilled manual)
  SC 5-6 (Semi-skilled and unskilled)
  Unclassified
Area deprivation [20] Quintiles