Research on the difference of hair distribution among patients with different degrees of AGA

FENG Su-yun; WANG Ji-ping; ZHAO Yong-gang; LEI Ming

doi:10.3969/j.issn.1673-7040.2017.03.007

Abstract：Objective To evaluate the difference of hair distribution in the posterior occipital areas of hair loss patients with varying degrees of androgen alopecia (AGA).Methods One hundred and fifty patients with AGA were divided into three groups according to their different degrees of hair loss.The hair detection and analysis system were used to take photos,and the average hair density,average hair follicle unit density,the ratio of hair number to follicular-unit (hair/FU ratio),average woolly hair percentage and average hair diameter were calculated.Results The degree of hair loss in group one was Ⅰ to Ⅲ.The average hair density in the posterior occipital region was (129.8 ± 12.0)/cm2,the average follicular unit density was (67.7 ± 7.1) FUs/cm2,the average hair/FU ratio was 1.93 ± 0.17,the average woolly hair percentage was (3.56 ± 2.10)％,and the average hair diameter was (0.092 ± 0.009) mm.The degree of hair loss in group two wasⅣtoⅤ,average hair density was (129.4 ± 14.2)/cm2,the average hair follicle unit density was (66.7 ± 6.6) FUs/cm2,the average hair/FU ratio was 1.95 ± 0.22,the average woolly hair percentage was (6.09 ± 3.23)％,and the average hair diameter was (0.090 ± 0.012) mm.The degree of hair loss in group three was Ⅵ to Ⅶ,the average hair density was (119.0 ± 15.0)/cm2,the average follicular unit density was (65.8 ± 8.2) FUs/cm2,the average hair/FU ratio was 1.79 ± 0.21,the average woolly hair percentage was (7.08 ± 3.54)％,and the average hair diameter was (0.078 ± 0.008) mm.Conclusion The more severethe hair loss,the more obvious the hair change in the posterior occipital region.As the woolly hair proportion increased,the hair density decreased,the hair/FU ratio indicated thinner hair,and the diameter of the hair decreased.