Study population was described at the previously published paper(23). Body Mass Index of 10751, 5th grade students from nation-wide were calculated. From this distribution lowest 10 % and highest 10% were selected as group 1 and group 5, respectively.
In this paper, between group 1 and group 5 anthropometric data, demographic data and other health related factors were compared.
1) Using Japanese criteria for obesity, the prevalence for obesity at 5th grade was 5.8 % at nation-wide and 7.8 % at urban area
2) The proportion of students who skipped breakfasts everyday was 5.8 % of whole student surveyed and 8.4 % for group 5.
The proportion of students who took medicine for health was 29A % for group and 22.5 % for group 5.
3) The students who are at group 5 had larger height and weight velocity than other groups. Group 5 had large increase of BMI by increasing grade, but group 1 had almost no change.
4) In physical fitness examination, group 3 who had mean BMI was in the highest class than other groups and group 5 was in low class.
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