![]() ![]() The correlation between MEDs and skin types ranged from 0.5 to 0.69. The MEDs of NBUVB radiation were 390, 550, 770, and 885 mJ/cm 2 for the 4 skin types. ![]() The MEDs of UV-A radiation were 22, 42, 86, and 100 J/cm 2 for skin types I, II, III, and IV, respectively. The median MEDs of UVA + UVB radiation were 22 mJ/cm 2 for Fitzpatrick skin types I and II, and 33 and 43 mJ/cm 2, respectively, for skin types III and IV. Erythema was assessed visually and with a Mexameter MX 18 device. Narrowband UV-B (NBUVB) radiation was measured in a phototherapy cabin. We used a solar simulator to measure UV-A radiation and combined UV-A and UV-B (UVA + UVB) radiation, for MED calculation. Patients and methodsĬross-sectional study of 113 individuals in Bogotá, Colombia. We also studied concordance correlation between MEDs and two alternative ways to assess erythema. We aimed to determine MED values in a sample of Colombian patients and correlations between MED and Fitzpatrick skin type. Different ways to assess erythema are also relevant. The minimal erythema dose (MED), an essential measurement in studies of skin photosensitivity, requires establishing MED values for specific populations, given genetic variation.
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