Table 1.
Descriptive statistics of all study variables, for the total sample (N=965) of quintile three primary schoolchildren in the Nelson Mandela Bay region
| Social and demographic background | n | % | |||
|---|---|---|---|---|---|
| Sex | |||||
| Girls | 467 | 48.4 | |||
| Boys | 498 | 51.6 | |||
|
|
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| n | Mean | SD | Min | Max | |
|
|
|||||
| Age (years) | 965 | 9.5 | 1.0 | 8.0 | 15.0 |
| Socio-economic status (0–9) | 957 | 7.5 | 2.1 | 0.0 | 9.0 |
|
| |||||
| Anthropometrics | n | Mean | SD | Min | Max |
|
| |||||
| Height (cm) | 960 | 133.2 | 7.1 | 109.2 | 165.3 |
| Weight (kg) | 960 | 30.5 | 7.6 | 15.8 | 87.4 |
| BMI (kg/m2) | 960 | 17.0 | 3.0 | 11.5 | 41.7 |
|
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| BMI-for-age | n | % | |||
|
|
|||||
| Underweight | 43 | 4.5 | |||
| Normal weight | 737 | 76.8 | |||
| Overweight | 125 | 13.0 | |||
| Obese | 55 | 5.7 | |||
|
| |||||
| Anthropometric status | n | Mean | SD | Min | Max |
|
| |||||
| HAZ | 960 | −0.8 | 1.1 | −4.7 | 3.1 |
|
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| Stunting | n | % | |||
|
|
|||||
| Not stunted | 850 | 88.5 | |||
| Stunted | 110 | 11.5 | |||
|
| |||||
| Physical fitness | n | Mean | SD | Min | Max |
|
| |||||
| Flexibility (cm) | 895 | 31.3 | 5.9 | 9.1 | 47.6 |
| Upper body muscular strength (kg) | 895 | 12.1 | 3.1 | 2.8 | 25.2 |
| Lower body muscular strength (cm) | 891 | 123.8 | 19.7 | 39.0 | 181.0 |
| CRF (VO2max, mL−1kg−1min−1) | 874 | 49.1 | 4.3 | 32.3 | 61.9 |
The different number of children per variable are due to different number of missing values for different variables. BMI, body mass index; HAZ, height for age; CRF, cardiorespiratory fitness.