Studies on the increase in height and weight in schoolboys

Abstract

Studies on the process of growth were made on about 38 male subjects living in Osaka City following their height and weight for 12 years that is from 6 to 17 years of age. The following results were obtained:1) High correlation (r=0.85) was found between the height of 1st year of primary school (6 years old) and that of final year of high school (17 years old). Relative high correlation (r=0.56) was found between the height in the final year of high school and the maximum growth quantity in the 1st growth (L).2) Maximum value in the rate of annual growth of height was recognized in 12 years old and minimum value in 10 years old.3) It seems that the rate of annual growth of height at 12 years of age is higher in a relatively high group compared with a relatively low group in the final year of high school.4) A linear relationship is found between the growth of height and logarithm of weight for 12 years. This slope (B) seems to relate to Rohrer's index.