In this study conducted at Saveetha Dental College, researchers found that the severity of male androgenetic alopecia, as graded by Norwood's classification, increased with age, although other factors such as genetic or hormonal influences were not assessed.
June 2024 in “Archives of Dermatological Research” In this study, significant upregulation of the genes SFRP2 and PTGDS was found in bald hair follicles of female pattern hair loss patients compared to non-bald follicles, suggesting these genes may be biomarkers and play a role in hair loss for this condition.
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September 2011 in “Archives of dermatology” This case report describes a 3-year-old male with X-linked ichthyosis and associated neurologic abnormalities, identifying an unusual cortical development malformation and suggesting that abnormal hair banding may assist diagnosis.
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December 2004 in “BMC Public Health” This study found that trained observers using the Hamilton-Norwood classification were very reliable in assessing balding patterns, while men's self-assessments were moderately accurate compared to observers.
March 2022 in “Journal of The American Academy of Dermatology” This study characterized the incidence of hair loss patterns among men of different races, highlighting a lack of direct racial comparisons in previous research.