A Study on the Rating of the Insureds' Anthropometric Data IX. A Study on the Change of Cardiothoracic Ratio by Age

피보험체계측치(被保險體計測値)의 평가(評價)에 관한 연구(硏究) 제9보(第9報) 심흉비(心胸比)의 연령적(年齡的) 변화(變化)에 관한 연구(硏究)

A study on the change of cardiothoracic ratio by age calculated from photofluorography film of chest in a total of the 8,115 insureds was undertaken. The results were as follows: 1. The incidence of cardiothoracic ratio of high value increased gradually with age. 2. At the same build, the average cardiothoracic ratio increased gradually with age. 3. Larger the build index was, the incidence of higher cardiothoracic ratio increased. 4. It seemed that the change of cardiothoracic ratio by age was influenced mainly by age and build(the change of build by age) from $18{\sim}19$ to $40{\sim}49$ age group and by age itself in $50{\sim}59$ age group and over. 5. The average cardiothoracic ratio of $30{\sim}39$ age group in male or female was approximate to that of all ages group respectively.