A Follow-up of the Physical Growth during the Primary and Junior High School Period (Preliminary Study)

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  • 追跡法による小・中学生時期の身体成長様相の観察 (予報)
  • ツイセキホウ ニ ヨル ショウ チュウガクセイ ジキ ノ シンタイ セイチョウ ヨウソウ ノ カンサツ ヨホウ

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With the 1, 072 boys and girls attending A and B junior high schools in Fukushima Prefecture, we pursued their individual growth through the annual physical examination records in and after the 1st grade. Checked items were 3 : stature, weight, and bust girth.<BR>1) General Distinction : With A school, boys' averages by grade are below the national averages and similar to the prefectural ones. Girls' averages indicate no significant differences from the national and the prefectural averages. With boys and girls of B school, their respective averages for each grade are above the national and prefectural averages.<BR>2) Growth Process : The respective averages by grade and sex confirm an obvious growth with age and a sexual difference. From 1st to 4th, boys slightly excel. Then girls keep showing greater increases till the 7th grade, resulting in their ascendancy. During the last two grades, however, boys outstrip girls and get ahead. As to the total gain in the 6 years (1st to 7th), girls are superior both in its amount and in its ratio.<BR>3) Growth and Menarche : (1) Earlier growth means earlier menarche. (Menarcheal rate before the examination in the 7th grade is 38% at school A and 60% at B.) (2) Growth is conspicuous during a year or two before menarche and then slows down. With stature, rapid increase is followed by stagnation. In weight and bust girth, this contrast is not so striking as in stature. Both continue to show a less but gradual increase.<BR>This is a preliminary study for our further pursuit of growth features through our own measurement.

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