Table 1. Population characteristics.

	Mean	SD	Median	Minimum	Maximum
Age (yrs)	9.03	0.97	9.00	7.00	10.00
Weight (Kg)	35.12	8.91	33.43	17.85	72.30
Height (m)	1.36	0.08	1.36	1.12	1.69
BMI (Kg/m2)	18.75	3.18	18.34	11.24	31.88
Waist circumference (cm)	63.59	8.53	62.00	32.10	104.00
Waist-to-height ratio)	0.47	0.05	0.46	0.22	0.73
Fat composition* (Fat %)	24.21	5.54	23.99	4.56	49.86
Hours sleeping	8.66	1.09	8.00	7.30	14.00
METs sleeping (MJ/wt/night)	1.25	0.33	1.21	0.69	2.81
Hours walking to school	0.25	0.25	0.00	0.00	0.50
METs MJ journey to school/wt	0.11	0.12	0.00	0.00	0.40
PA hours of physical education	1.92`	0.54	2.00	0.00	7.00
METs PA (MJ/wt)	0.82	0.33	0.33	0.00	4.13
Hours of extracurricular PA	0.46	0.33	0.43	0.00	2.14
METs extracurricular PA/day/wt	0.37	0.27	0.29	0.00	1.88
Moderate activity up to 24 h	12.71	1.42	13.20	6.21	15.86
METs sedentary/day/wt	2.60	0.75	2.51	1.10	5.39
Total 24-H METs (MJ/day)	8.73	1.33	9.28	1.41	12.04
Total MJ intake /day	9.15	2.85	9.55	2.81	12.80
% energy fat	30.76	11.63	32.70	20.90	40.70
% energy protein	12.94	7.10	13.8	5.74	20.67
% energy carbohydrate	54.98	9.23	56.94	7.25	71.0
KIDMED	8.93	2.05	9.00	3.00	13.00
% participants in each BMI category		Normal weight	Over weight	Obesity
		62.3	26.8	10.9	p<0.001

*Fat % calculated as 106.50 x WHI– 28.36 for boys and as 89.73 x WHI– 15.40 for girls [22].

**MET data for different degrees of activity were based on the values proposed by Harrell et al. [23] and Ridley et al [24].