EXAMPLES 119 



Vital capacity derived from length of trunk (35 in.) = 



3677 c.c. (from Table XXIII, Class A). 

 Vital capacity derived from circumference of chest 29^ 



in.) = 3430 c.c. (from Table XXIV, Class A). 



Averaging 3677 + 3430 -^ 2 = 3554 c.c., which is the nor- 

 mal vital capacity for Class A corresponding to the length of 

 trunk and circumference of chest. 



Subtracting the calculated from the observed vital capacity, 

 3630 - 3554 = +76 c.c. 

 +76 X 100 *- 3554 = +2-14% (or roughly +2%). 



Therefore the person has 2% greater vital capacity than she 

 should have according to the Tables for Class A, calculated 

 from length of trunk and circumference of chest. 



Example 12 



MALE, AGE 13 YEARS 



Weight of body = 89 Ib. 5 oz. 



Observations 



Length of trunk = 30% inches 



Circumference of chest = 28% inches 

 Vital capacity = 2880 c.c. 



CALCULATION 



Weight from length of trunk = 87-79 Ib. 

 Weight from circumference of chest = 87 - 57 Ib. 

 Averaging 87-79 + 87-57 -f- 2 = 87-68 Ib. = weight calcu- 

 lated. 



Subtracting calculated from observed weight, 

 89-31 - 87-68 = +1-63 Ib. 

 + 1-63 X 100 -s- 87-68 = +1-86%. 



Therefore the person is 1-86% too heavy. 



Vital capacity from weight = 3011 c.c. (Class A) = 

 (vital capacity calculated from weight). 



Subtracting calculated from observed vital capacity, 

 2880 - 3011 = -131 c.c. 

 -131 X 100 * 3011 = - 435%. 



