The family histories of scalp hair growth of 56 women with male-type alopecia have been compared with those of women with alopecia areata and with normal controls. Of the first-degree relatives of the propositi with male-type alopecia who were more than 30 years old, 54% of the males and 23% of the females also had this trait, compared with figures of 20.5% and 7% among the relatives of the alopecia areata propositi, and slightly lower figures still among the relatives of the normal controls.
SMITH MA, WELLS RS. Male-Type Alopecia, Alopecia Areata, and Normal Hair in Women: Family Histories. Arch Dermatol. 1964;89(1):95–98. doi:10.1001/archderm.1964.01590250101017
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