354 



Scientific Proceedings (130) 



2.5 L L2 



(1) T = 2.3 H 1 . 



; ' - 28 784 



This may be simplified to : 



(2) T « ^ + 1-25)2 + 0.74. 



For estimating the crown-heel length from the age, the 



formula may be transformed into 



L = 28 VT — 0.74 —35. 



These formulae may also be modified for further use. Accord- 

 ing to Mall, the cohabitation age averages 10 days less than the 

 menstrual age which is estimated from the first day of the last 

 menstruation, and the individual deviations from this average 

 are quite small. Therefore, the formula for menstrual age may 

 be modified to 



2.5 L L2 

 (3) T = 1.94 + -— + — 



28 /84 



or 



(4) (ii + 1.25)2 + 0.38 



to express the cohabitation age. 



While the above formulae are not complicated, somewhat sim- 

 pler ones may be used for approximate values. These are 



L 



(5) T = ( h 1.49)2 



v j v 30 J 



for estimating age from total length and 



(6) L = 30v"tF— 44.7 



for estimating length from age. 



The values given by these various formula? and their absolute 

 and percentage deviations from Mall's observed values are 

 shown in the accompanying tables. 



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