Studies on the Growtb of the Students in Different Areas

Abstract

Many surveys have been made to make, out difference in growth with relation to various regions possessing their own distinctive features. However, they have so far been based only on the comparison and the statistical observation of results obtained through body measurement. To know how developed the students are in their growth, we must observe the degree in which they get mature as well as results of measurements,
We judged of skeletal age, which is sustained by Greulich and Pyle, from the results of body measurement and 6. 6-size photoroentgenography of the left hand and wrist of students, 886 healthy boys and 872 girls from 7 years to 15 years of age living in four regions in Nagoya-residential, commercial, industrial, and agricultural areas which have distinguishing marks from the others. In addition, we have had this time a survey of menstruation of schoolgirls of junior high schools. The results obtained are as follows:
(1) There are different results recognized in body measurement taken among the four areas mentioned above; the residential and commercial regions are superior in stature and the agricultural in weight, and the industrial region is inferior to the other three in both respects.
(2) The development of the bone is almost as remarkable in the residential and commercial areas as stature is.
(3) The percentage of school-girls who have the menses is greater in the residential and commercial regions and the coming of the first menstruation is also earlier than in the other areas.
(4) To see the development of the bone, we have used roentgenography routine film, but we have found that, 6. 6 size photoroentgenography is useful for this purpose.