70 OBSERVATIONS AND MEASUREMENTS ACADEMY MEMBERS IMemoI [vol N xxin, 



Table 54. — Ear breadth 



Members of the Academy 



Old Americans 



Not old Americans 



Old Americans 

 at large (labora- 

 tory series) 



Subjects 



Average 



Minimum 



Maximum 



Range of variation in percentage of the average 

 a 



cv 



92 



3. 94 ±0. 017 



3.4 



4.6 



SO. 46 



0. 244 ±0.012 



6. 29 ±0. 31 



49 



4. ±0. 027 



3. 3 



4.7 



35. 



0.280 ±0.019 



7. 0±0. 48 



250 

 3.79 

 3.05 



4.6 

 40.90 



DISTRIBUTION 



Old Americans (92) 



Not old Americans (49). 



3.3 



2.0 



3.4-3.55 



Percent 



4. 4 

 4. 1 



Percent 



15. 2 

 12. 2 



3.8-3.95 



Percent 

 31. 5 

 24. 5 



Percent 

 31. 5 

 30. 6 



Percent 



13.0 

 18. 4 



Percent 

 3.3 

 4. 1 



Percent 

 1. 1 

 4. 1 



EAR BREADTH AND AGE 



Subjects to 60 years of age, inclusive 

 Average 



a 



CV 



Over 60 years of age 



Average 



a 



CV 



Members of the Academy 



Old Americans 



55 



3. 93 ±0. 022 



0. 240 ±0.015 



6. 11 ±0. 39 



37 



3. 96 ±0.027 



0. 247 ±0. 019 



6. 27 ±0. 49 



Not old Americans 



22 



3. 98± 0.031 

 0. 216 ±0.022 



5. 45 ±0. 55 

 27 



4. 02 ±0.042 

 0.320 ±0.029 



7. 93 ±0.73 



Old Americans 

 at large (labora- 

 tory series) 



250 

 3. 79 



