478 



CHAMBERLAIN. 



INFLUENCE OF INDIVIDUAL SIZE OF THE MEN ON THE BLOOD-PEESSUKE 



AND PULSE BATE. 



Since the heights and weights of all of the soldiers ia our series were 

 on record it seemed an excellent opportunity to investigate the influ- 

 ence of individual size on blood-pressure, a phase of the subject in 

 regard to which few data are available. In addition to the 993 soldiers 

 for each of whom we had an average pressure, deduced from 4 or 5 

 readings taken at intervals during a year, there were a number of other 

 men for whom 1, 2, or 3 pressure readings had been taken and the 

 observation then discontinued for one reason or another. The individual 

 averages for these men have been combined with the averages for the 

 992 previously considered, making a total of 1,243 men on whom 5,775 

 blood-pressure readings had been made. These men were then divided 

 into groups according to height in inches. The results are shown in 

 Table XIII. 



Table XIII. — Average systolic blood-pressures and pulse rates, based on 5,775 

 observations of each made on 1,243 healthy soldiers in the Philippines, arranged 

 according to height. (12.5-centimeter armlet.) 



Range of height. 



Average weight. 



Under 64 inches 



64 inches" 



65 inches 



66 inches 



67 inches 



68 inches 



69 inches 



70 inches 



71 inches 



72 inches and over . 



Averages 



Cm. 



162.5 



162. 5 



165.0 



167.6 



170.1 



172.7 



175.2 



177.7 



180.3 



182. 8 



Lbs. 



332.9 



134.7 



139.9 



141.9 



144.4 



147.2 



152.7 



155.6 



159.0 



164.5 



Kgnis. 

 60.4 

 61.2 

 63.6 

 64.5 

 65.6 

 6B.9 

 69.4 

 70.7 

 72.3 

 74.8 



145. 5 



6.1 



Number ^Y,^^^^® I Average 

 of men. P^^°' | pulse. 



27 



114 



157 



187 



225 



251 



127 



80 



40 



35 



mm. 

 117.9 

 114.7 

 116.0 

 115.5 



116. 2 

 115.7 

 116.2 

 117.9 



119. 3 

 120.6 



- 



79.0 

 80.3 

 80.0 

 81.5 

 80.4 

 82.3 

 82.6 

 80.2 

 81.5 

 83.0 



116.2 



81.2 



Average 

 age. 



Fears. 

 27.6 

 26.7 

 26.0 

 27.2 

 26.7 

 26.4 

 26. 2 

 27.1 

 26.6 

 25.8 



Average 

 tropical 

 service. 



Months. 

 13.4 

 17.1 

 15.9 

 17.2 

 16.8 

 17.8 

 16.1 

 16.0 

 15.2 

 17.6 



* This means that the men in the group were 64 Inches or more, but less than 65. 

 The next figure means that they were 65 or more, but less than 66. The same explana- 

 tion applies to the subsequent figures. 



It is to be observed in Table XIII that the weight progressively 

 increased with the height and that the average age and the average 

 length of tropical service did not vary materially in any of the height 

 groups. Therefore any difference in blood-pressure observed may safely 

 be attributed to the influence of height and weight. It is plain that 

 there is no progressive rise of blood-pressure with increasing size up to 

 and including 70 inches (177.7 centimeters) in height. For the groups 

 71 inches (180.3 centimeters) and over 72 inches (182.8 centimeters) 

 there does appear a tendency for the blood-pressure to rise 2 or 3 



