Quantitative Studies on Human Hair Growth(II). Correlation between Subjective Grading and Objective Measurements of Hair Growth.

The subjective grading and objective measurements were carried out on the hair growth of the androgenic alopecia subjects, and the correlation between the grading and the measurements was investigated for the evalution of alopecia. As a result, hair growth rate, the ratio of slow growing or resting hairs, hair diameter or the ratio of vellus hair correlated well with the stage of baldness, and it was suggested those parameters could be used as a fine index for the evaluation of hair growers.Two dimentional analysis by growth rate and diameter was made for typical patterns of hair growth, and investigated as the index of the baldness degree. The ratio of hair having higher growth rate and thicher diameter significantly decresed aaccording as the degree of baldness increased, and the ratio was investigated as the index of balding degree. It was concluded that the more accurate evaluation of alopecia could be attained with this index than the subjcetive grading only.