THE REGRESSION FORMULAE OF ESTIMATION OF THE PYRAMIDAL ANGLE DERIVED FROM THE MAXIMUM LENGTH AND THE DIFFERENCE BETWEEN THE LENGTH AND BREADTH OF ADULT CRANIA IN CHINESE
- VernacularTitle:国人成年颅由长径和长、宽径差推算锥体角的回归方程
- Author:
Yueran CHEN
;
Huaru LI
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1957;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
The pyramidal angles of 102 cases (204 sides) of Chinese adult crania were studied.The coefficient of correlation between the average figures of the cranial length and pyramidal angles were calculated. The coefficient of correlation between the cranial length and the pyramidal angle is -0.288 and between the difference of cranial length and breadth and the pyramidal angle is -0.326, which denote a rather high degree of negative correlation. It is concluded that the maximum length is inversely proportional to the size of the pyramidal angle, that is, the greater the length, the less the angle and vice versa.The mean value of the pyramidal angles is 52? (more exactly, 51.635?) in Chinese. The angles on both sides are nearly equal in 46.6% of cases, and are apparently different in 53.4% of cases. Its sex and side differences are insignificant.The authors calculated the regression formulae of the estimation of pyramidal angle from cranial length and from the difference between its length and breadth. The results of the estimation of regression formulae suggest that by taking the cranial length as 17 cm or their difference as 3 cm and the pyramidal angle as 52? to be the basic key values and if the cranial length or their difference increases by 1 cm, the pyramidal angle will decrease by 1 degree and inversely it is also true.
