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Measurement of family impact of skin disease: Validation of the Family Dermatology Life Quality Index

The convergent validity of the Family Dermatology Life Quality Index (FDLQI) adapted from the Impact on Family (IOF) scale was examined in 50 outpatients with different skin diseases. The adapted version of the IOF and FDLQI were completed by adult family members of patients, whereas patients completed the Dermatology Life Quality Index (DLQI). The median scores for the 3 instruments, FDLQI, IOF and DLQI were 4, 29 and 3, respectively. The FDLQI gave high internal consistency with a Cronbach's alpha score of 0.91. The convergent validity of the FDLQI was shown by a highly significant positive correlation between the mean FDLQI and IOF scale scores (rs=0.61; p<0.0001). All FDLQI items had ...