Descriptive characteristics of 650 children from Port Elizabeth, South Africa, in February and March 2018
| Outcome variables | M | SD | Min | Max | Skew | Kurt |
|---|---|---|---|---|---|---|
| Systolic blood pressure (mm Hg) | 109.5 | 11.3 | 78.0 | 145.0 | 0.2 | −0.1 |
| Diastolic blood pressure (mm Hg) | 66.5 | 8.1 | 42.0 | 110.0 | 0.4 | 1.2 |
| Skinfolds (mm) | 11.1 | 6.2 | 3.6 | 40.9 | 1.8 | 3.5 |
| Total cholesterol (mmol/L) | 3.6 | 0.6 | 2.5 | 6.1 | 0.8 | 0.5 |
| HDL cholesterol (mmol/L) | 1.4 | 0.3 | 0.7 | 2.6 | 0.7 | 0.5 |
| LDL cholesterol (mmol/L) | 1.8 | 0.6 | 0.5 | 3.9 | 0.6 | 0.5 |
| Triglycerides (mmol/L) | 0.8 | 0.3 | 0.5 | 3.3 | 2.6 | 11.9 |
| HbA1c (%) | 5.5 | 2.3 | 4.4 | 6.4 | −0.4 | 1.7 |
| Clustered risk index | 0.0 | 2.9 | −6.6 | 11.8 | 0.6 | 0.8 |
| Predictor variables | ||||||
| Sedentary activity (min/day) | 663.3 | 84.6 | 296.8 | 854.0 | −1.0 | 1.9 |
| Light physical activity (min/day) | 261.8 | 50.4 | 51.0 | 409.3 | −0.5 | 1.1 |
| Moderate physical activity (min/day) | 50.8 | 19.5 | 7.6 | 127.9 | 0.6 | 0.4 |
| Vigorous physical activity (min/day) | 21.7 | 15.6 | 1.2 | 117.0 | 1.7 | 4.5 |
| Moderate-to-vigorous physical activity (min/day) | 72.5 | 32.9 | 8.8 | 218.6 | 0.9 | 1.2 |
| Cardiorespiratory fitness (completed laps in 20 m shuttle run test)† | 36.4 | 20.2 | 6.0 | 99.0 | 0.8 | 0.0 |
| Potential confounders (metric) | ||||||
| Age (years) | 12.4 | 0.9 | 10.0 | 15.0 | 0.5 | 0.1 |
| Socioeconomic status (0–9)‡ | 7.6 | 2.0 | 0.0 | 9.0 | −1.6 | 2.0 |
| Potential confounders (nominal) | N | % | ||||
| Sex | ||||||
| Girls, n (%) | 351 | (54.0) | ||||
| Boys, n (%) | 299 | (46.0) | ||||
| Ethnicity§ | ||||||
| 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.