no. 3j PSYCHOLOGICAL EXAMINING IN THE UNITED STATES AKMY. 817 



Table 371. — Relation of intelligence ratings to age of 949 white officers, Camp Devens. Means and standard deviations 



with examination a. 



Although the general trend toward decreasing score with increasing age can thus be une- 

 quivocally made out, the deviation of individual cases from the rule is very wide indeed. On 

 the average older men score lower; but the chances that a particular older officer will make a 

 lower score than a particular younger one are very little greater than that the reverse will be 

 the case. The scatter of the cases is wide and the coefficients of correlation are correspondingly 

 small. The following coefficients of correlation between age and score in examination a illus- 

 trate the point: 



5,404 medical officers, Camp Greenleaf —0. 192 



2,475 medical officers, Camp Greenleaf, 21-30 years - . 063 (P. E., 0.013) 



3,267 medical officers, Camp Greenleaf, 30-60 years - . 192 (P. E., .011) 



146 medical officers, Camp Devens — . 011 



308 infantry officers, Camp Devens — . 120 



The question arises as to whether this inverse relation of age and score begins at 21 years 

 (the lowest age) or at some higher point. The general evidence of the data on officers is that 

 with officers the decrease is continuous throughout the range of ages. The data of the principal 

 sample in table 366 and the data from Camps Greenleaf and Devens in tables 369 and 371 all 

 show a continuous trend between the years 21 and 30. Camps Dix, Taylor, and Lee (tables 

 367, 368, and 370) appear not to show a trend in either direction within these limits. There 

 are certain meager data on enlisted men, who naturally fall between the ages of 20 and 31, which 

 also fail to show any decrease of score with age. A report from Camp Lee gives for 594 white 

 enlisted men the following median scores in examination a: 



Camp Upton reports alpha scores of 600 white enlisted men for the two extreme age groups 

 within the draft limits : 



