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Table 4 Body composition characteristics by school quintile in 2010 and 2013 and significance of differences during follow-up according to mixed models with school included as subjects

From: Prevalence of overweight and obesity among primary school children in a developing country: NW-CHILD longitudinal data of 6–9-yr-old children in South Africa

  Quintile 1 (n = 120) Quintile 2 (n = 96) Quintile 3 (n = 130) Quintile 4 (n = 108) Quintile 5 (n = 120) P value Mixed Models MSE
  2010 2013 2010 2013 2010 2013 2010 2013 2010 2013 2013 2013
Height (cm) 118.1 113.4 116.7 132.7 117.1 133.4 122.9 137.2 123.2 139.3 <0.001 80.9
Mass (kg) 21.4 30.3 21.0 29.1 20.5 28.9 24.7 36.1 24.7 36.4 <0.001 68.3
BMI (kg/m 15.4 16.7 15.3 16.4 15.0 16.3 16.2 18.7 16.2 18.6 <0.001 13.2
Fat % 14.4 18.9 15.4 18.3 14.1 17.9 17.8 23.2 17.6 23.4 <0.001 61.5
  1. N = number of participants, BMI = Body Mass Index; Fat % = Fat percentage; Significant difference p < 0.05, MSE = mean square error.