Table 1

Descriptive characteristics of 650 children from Port Elizabeth, South Africa, in February and March 2018

Outcome variablesMSDMinMaxSkewKurt
Systolic blood pressure (mm Hg)109.511.378.0145.00.2−0.1
Diastolic blood pressure (mm Hg)
Skinfolds (mm)
Total cholesterol (mmol/L)
HDL cholesterol (mmol/L)
LDL cholesterol (mmol/L)
Triglycerides (mmol/L)
HbA1c (%)−0.41.7
Clustered risk index0.02.9−6.611.80.60.8
Predictor variables
Sedentary activity (min/day)663.384.6296.8854.0−1.01.9
Light physical activity (min/day)261.850.451.0409.3−0.51.1
Moderate physical activity (min/day)50.819.57.6127.90.60.4
Vigorous physical activity (min/day)21.715.61.2117.01.74.5
Moderate-to-vigorous physical activity (min/day)72.532.98.8218.60.91.2
Cardiorespiratory fitness (completed laps in 20 m shuttle run test)†36.420.
Potential confounders (metric)
Age (years)12.40.910.
Socioeconomic status (0–9)‡−1.62.0
Potential confounders (nominal) N%
 Girls, n (%)351(54.0)
 Boys, n (%)299(46.0)
 Black African, n (%)384(62.3)
 Coloured, n (%)232(37.7)
  • †Seventeen children with missing values.

  • ‡Thirty-seven children with missing values.

  • §Thirty-four children with missing values. N=596 after listwise exclusion of missing cases. Scores for triglycerides were log-transformed (skewness (skew) and kurtosis (kurt) values presented in brackets).

  • HbA1c, blood glucose; HDL, high-density lipoprotein; LDL, low-density lipoprotein.