<qa>  What was the BMI determined according to?Students were weighed on a digital scale twice and the average was recorded. Participants removed shoes and jackets before heights and weights were measured. Participants heights were measured using a metric measuring tape affixed on the wall. Body weight and height were measured using the same instruments, at the same place and day of the week, before the start of the days program. Non-extensible steel tapes were used to assess waist circumference, which was measured at the level of the mid point between the lower costal border and the iliac crest. All the anthropometric measures were conducted using the International Society for the Advancement of Kin anthropometry procedures. BMI was determined according to the following formula: BMI weightheight2. We used the cut off points for the BMI in childhood presented by Cole et al in order to allow international comparisons with our findings in the prevalence of overweight and obesity. Pulses per minute were measured using an automated blood pressure monitor under standardised procedures. 