Abstract
The rate of round-back children of the primary schools in Kanagawa prefecture and their respiratory and circulatory functions were examined.
The rate was about 10% in 1952, but recently it has reached over 20%. In 1951 and 1952, it was higher in lower school classes, but now it is higher in upper classes. While in 1951 and 1952 its male/female ratio was about 2.0, the ratio has become 1.2-1.4 in 1958-1960.
A correlation was found, to some extent, between the rate of round-back and the number of carious teeth. Further, the rate in fishing district was higher than rgsidential, commercial, industrial and agricultural districts.
The increase of respiratary frequency and pulse rate of round-back group after 100 meter dash was more marked than normal group. This result suggests that round-back children may have some inferiority in respiratory and circulatory functions.
