Minimal erythema dose (MED) was associated with skin color, sex, season, and meteorological factors, but not with age, according to study results published in the Journal of the European Academy of Dermatology and Venerology.

Studies have suggested that MED has substantial interindividual and intraindividual differences, reflecting the influence of diverse factors such as skin color, sex, age, season during which testing was performed and meteorological factors. However, previous studies lacked consistency, had irreproducible results, or had opposing results. Therefore, researchers sought to investigate the factors associated with MED in a large-scale population study.