472 



CHAMBERLAIN. 



climates. For the period from 30 to 40 years our average was 118 milli- 

 meters, which is 9 millimeters lower than Woley's but only 2 millimeters 

 lower than Bachmann's experience for the same ages. The pulse rate for 

 all ages was 9 beats above the accepted normal for temperate climates.- • 



INFLUENCE OF LENGTH OF TROPICAL RESIDENCE ON BLOOD-PRESSURE 



AND PULSE RATE. 



Since the number of men who had lived over a year in the Philippines 

 was considerably greater for the 1909-Group than it was for the 1910- 

 Grroup these two groups have been tabulated separately according to 

 length of tropical service in Tables III and IV, as well as combined in 

 Table V. The average age of the men in the group for each quarterly 

 period of tropical service has also been given because age has a distinct 

 bearing on blood-pressure. As stated above, our complete series of 

 blood-pressure observations consisted of 4 or 5 readings for each individual, 

 evenly spaced through a year, but in the next 3 tables only the first of 

 these readings has been considered and the figures in the first column 

 of each of the 3 tables indicate the number of months- intervening 

 between the date of arrival in the Philippines and date of the initial 

 blood-pressure reading for each soldier in the sub-group. 



Table III.- — Average systolic blood-pressures and pulse rates for 587 men of 

 the 1909-Oroup, arranged by length of Philippine residence. {12.5-centimeter 

 armlet. ) 



Length of tropical residence. 



Number 

 of men. 



Average 

 pres- 

 sure. 



Average 

 pulse. 



Ai erage 

 age. 



3 months or less _ _ _ . 



76 

 14 

 123 

 232 

 47 

 26 

 22 

 47 



mm. 

 110 

 118 

 112 

 118 

 118 

 122 

 119 

 120 



75 

 78 

 76 

 89 

 77 

 79 

 83 

 84 



23.8 

 26.1 

 24.3 

 24.0 

 24.6 

 30.0 

 30.5 

 33.3 



3 to 6 months . . 



6 to 9 months- 



9 to 12 months 



12 to 15 months 



15 to 33 months 



33 to 36 months _ - 



Over 36 months 





Table IV. — Average systolic Mood-pressures and pulse rates for 40^ men of 

 the 1910-Group, arranged by length of Philippine residence. {12.5-centimeter 

 armlet. ) 



Length of tropical residence. 



Number 

 of men. 



Average 

 pres- 

 sure. 



Average 

 pulse. 



Average 

 age. 



3 months or less 



158 

 74 

 88 

 59 

 25 



mm. 

 116 

 120 

 117 

 113 

 124 



77 

 80 

 75 

 73 



77 



27.0 

 27.0 

 27.2 

 30.3 

 33.3 



3 to 6 months 



6 to 9 months _- — 



9 to 12 months 



Over 12 months _ 





