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

January 1994 in “ Journal of S C C J ”

Mariko Hara, Takeshi Sakamaki, Shoji Hayashi, Kunihito Tanaka, Masahiro Sada, Itaru Miyamoto

androgenic alopecia hair growth rate hair diameter vellus hair baldness alopecia baldness hair growth

TLDR The study concluded that certain hair growth measurements are good indicators of baldness severity and provide a more accurate assessment than subjective grading.

In 1994, a study was conducted on androgenic alopecia subjects to investigate the correlation between subjective grading and objective measurements of hair growth. The study found that hair growth rate, the ratio of slow-growing or resting hairs, hair diameter, and the ratio of vellus hair correlated well with the stage of baldness. These parameters were suggested as useful indices for evaluating hair growth treatments. A two-dimensional analysis by growth rate and diameter was used to identify typical patterns of hair growth. The study found that the ratio of hair with a higher growth rate and thicker diameter significantly decreased as the degree of baldness increased. This ratio was proposed as an index of balding degree. The study concluded that this index provided a more accurate evaluation of alopecia than subjective grading alone.

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