Androgenetic alopecia affects all ethnicities, but the patterns and progression characteristics vary meaningfully. Asian patients (East Asian and South Asian populations) typically show later onset, slower progression, and different pattern distribution compared to European populations. The Norwood scale was developed primarily from European study populations and doesn't always capture these patterns accurately.

Specific differences documented in epidemiological studies: prevalence rates of significant pattern hair loss in Asian men by age 50 are roughly 30–40%, compared to 50% in European men. The pattern distribution skews toward later vertex involvement with less frontal recession in earlier stages. Donor hair characteristics also differ, typically thicker individual shaft caliber but lower follicular unit density per cm² of donor area, which affects hair transplant planning considerably.

Treatment responses also vary. Asian patients show generally good response to standard minoxidil and finasteride, though some studies suggest slightly lower percentage response rates to topical minoxidil than European populations, potentially related to SULT1A1 polymorphism distributions. Hair transplant approaches are typically adjusted for the donor characteristics, more reliance on individual graft density rather than total graft numbers for given coverage areas. Patient expectations should be calibrated by the population-specific data rather than the Western norm.