BASAL METABOLISM OF NORMAL MEN AND WOMEN. 207 



Finally we have employed an equation in which prediction of heat- 

 production is made from weight, stature, and age. 



The characteristic equations for the calculation of total heat- 

 production from age, surface, weight, and stature considered alone are : 



h= 1823.80 -7.15o 



h = -254.546 + 1070.454 a 



Li 



A= 617.493 + 15.824 w 

 h=- 1237.637 + 16.589s 



where h= total heat, a = age, a D = body-surf ace area by the Du Bois 

 height-weight chart, w = body- weight, and s= stature. 



Employing these equations, we have calculated the theoretical 

 heat-production of each individual woman on the assumption that 

 she is a man of like character. The difference between her observed 

 metabolism (24-hour period) and her theoretical metabolism has then 

 been determined by taking 



(measured metabolism) less (theoretical metabolism) 



Thus a negative sign denotes a deficiency in the actual as com- 

 pared with the normal heat-production. 



TABLE 77. Differences in the metabolism of men and women, women classified according to age. 



In basing our conclusions concerning the existence of a sexual 

 difference in metabolism upon these differences we have examined 

 them in three ways: (a) We have compared the average values of 

 observed and theoretical metabolism in groups of women classified 

 with respect to age, stature, body surface, and weight. (6) We have 

 compared the average values of observed and of theoretical heat- 

 production in groups of individuals classified by both stature and body- 

 weight. Finally, (c) we have arranged the differences in order according 

 to sign and magnitude and considered the evidence furnished by the 

 frequency distributions of the individual deviations. 



The results of a comparison of the total heat-productions with 

 those computed from age and classified according to the age of the 

 women are shown in the first panel of table 77. The differences are 

 without exception negative in sign, thus indicating that the metabol- 



