INDIVIDUALS AND MEASUREMENTS CONSIDERED. 



51 



those due to other observers. The differences can be looked upon as 

 statistically trustworthy in only 2 or 3 of the comparisons. Quite 

 comparable results, as far as the smallness of the differences are con- 

 cerned, are found for the coefficients of variation. In 5 of the 10 cases 

 our series are relatively less variable and in 5 cases relatively more 

 variable than those with which they are compared. The differences 

 are statistically insignificant except in 3 or 4 cases. Thus our babies 

 are slightly heavier than those measured by others except Taylor, 

 but agree excellently in variability, both absolute and relative. 



TABLE 6. Comparison of weight of Nutrition Laboratory babies with other series. 



For comparison with our results for length we may reduce the 

 British Association data used for body-weight above. The constants 

 for the 451 boy and 466 girl babies are: 



Mean. S. D. C. V. 



Male infants 49.580.11 3.480.08 7.020.16 



Female infants 49.070.10 3.250.07 6.620.15 



We may also compare Pearson's constants for full-term male and 

 female infants (1000 each) from the Lambeth Lying-in Hospital. 33 His 

 results are: 



Mean. S. D. C. V. 



Male infants 52.080.07 3.380.05 6.500.10 



Female infants 51.110.06 2.990.05 5.850.09 



Dr. Rood Taylor's infants give the following values for total length : 



Mean. S. D. C. V. 



Male infants 51.1S0.13 2.040.09 3.980.17 



Female infants 50.070.12 2.030.09 4.0S0.18 



Comparison with our own series is made in table 7. 

 The average length of our babies is slightly greater than the British 

 Association series but slightly less than the Lambeth Hospital series. 



"Pearson, Proc. Roy. Soc. Lond., 1899, 66, p. 25. 



