Investigation of the skin types, minimal erythema dose and minimal persistent pigment darkening dose among the population of Chongqing
Abstract：ObjectiveTo investigate the skin phototype and the scope of minimal erythema dose (MED) and minimal persistent pigment darkening dose (MPPD) among the population of Chongqing.MethodsSkin phototype was investigated by questionnaire according to the classification of Fitzpatrick skin type. MED and MPPD of participants were determined by using GS2004/2006 multiband standard sun simulator.ResultsAmong the 200 participants, the percentages of skin typeⅡ,Ⅲ andⅣ were 15.0%, 73.5% and 11.5% respectively, and skin typeⅠ,Ⅴand VI were not found. The means of MED for the skin typeⅡ,Ⅲ andⅣ were (63.21±18.22) mJ/cm2, (70.23±17.01) mJ/cm2 and (78.45±20.11) mJ/cm2 respectively. The means of MPPD for the skin typeⅡ,Ⅲ andⅣ were(12.52±3.41)J/cm2, (10.22±3.09) J/cm2 and (8.43±2.51) J/cm2 respectively. From the skin typeⅡ toⅣ, the value of MED increased gradually, and the value of MPPD decreased gradually. There was statistical difference among the different skin types, nevertheless, no signiifcant differences were found among different age and gender groups (P>0.05).ConclusionAmong the population of Chongqing city that have been investigated, skin typeⅢ was the main type, and the mean values of MED, MPPD for skin typeⅢ were (70.23±17.01)mJ/cm2 and (10.22±3.09)J/cm2. The skin type in Chongqing is similar to in other Chinese cities, however, for the scope of MED and MPPD, there is a discrepancy between Chongqing and other districts.
Keywords：Skin typeMinimal erythema doseMinimal persistant pigment doseChongqing
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 411-413 )