Table 1

Characteristics of the main (SAGE South Africa Wave 2, 2015) and subsample study cohort

Main SAGE cohort n=2887Subsample* n=875P value
Female, n (%)19396767177<0.001
Age (years)5746, 695544, 670.468
Aged over 50 years, n (%)197969567650.171
Ethnicity, n (%)
 Coloured, mixed race465169617
Rural, n (%)79228163290.418
Education (years)107, 1396, 120.028
Never been to school, n (%)49518109200.180
Never had paid employment, n (%)110155238560.403
BMI (kg/m2)28.823.9, 33.729.124.0, 34.20.540
Waist-to-height ratio0.590.52, 0.670.580.50, 0.660.070
Never used alcohol, n (%)157680353830.052
Never used tobacco, n (%)163583367860.023
Systolic BP (mm Hg)131118, 144128116, 1410.073
Diastolic BP (mm Hg)8173, 897971, 870.029
Hypertension, n (%)123345232430.239
Diabetes, n (%)2481346110.355
  • *Subsample: all respondents with spot UIC, valid 24-hour urine, sex and age recorded. Some variables may contain missing data as indicated by percentages. Data shown as median and IQR (25th, 75th percentiles) unless otherwise indicated. Hypertensive by measured BP≥140 and/or 90 mm Hg or previous diagnosis. Education, tobacco/alcohol use, ethnicity, employment and diabetes prevalence by self-report. Continuous variables compared using independent samples Mann-Whitney U test, categorical variables compared using Pearson’s χ2test and Fisher’s exact test.

  • BMI, body mass index; BP, blood pressure; SAGE, Study on global AGEing and adult health.