Japanese version of the Family Dermatology Life Quality Index: Translation and validation.
Skin conditions affect the quality of life (QoL) of patients and their family. To assess family members' QoL, a questionnaire uniquely designed for family members is necessary. We translated the Family Dermatology Life Quality Index (FDLQI), originally created and validated by Basra et al., into Japanese, and evaluated its reliability and validity. For psychometric evaluations, 150 dermatology patients and their family members were included. The Japanese version of the FDLQI showed high test-retest reliability (intraclass correlation coefficient = 0.95) and internal consistency reliability (Cronbach's alpha = 0.86). FDLQI scores significantly correlated with DLQI scores (r = 0.58, P < 0.01, Spearman's rho) and global question (GQ) which measured the patient's skin condition on a visual analog scale (r = 0.36, P < 0.01). Family members of patients with inflammatory skin diseases showed higher FDLQI scores than those with isolated lesions, but the difference was not statistically significant (P = 0.062, Mann-Whitney U-test). Responsiveness to change was demonstrated in a group in which the patient's skin condition was assessed as improved (n = 37, r = 0.46, P < 0.01) but not in that in which it became worse. The difference of the change between the two groups was statistically significant (P < 0.01). Additionally, the change in FDLQI scores and GQ were significantly correlated (r = 0.40, P < 0.01). Exploratory factor analysis suggested essential unidimensionality of the instrument. We showed acceptable validity and responsiveness of this Japanese version of FDLQI. Further clinical epidemiological studies are required to confirm this.
Institute of Women's Health, Tokyo, Japan.|Department of Dermatology, Tokyo Women's Medical University, Tokyo, Japan.
Yuko
http://orcid.org/0000-0001-5314-8357
Y
Higaki
Department of Dermatology, Tokyo Women's Medical University Medical Center East, Tokyo, Japan.
Masaru
M
Tanaka
Department of Dermatology, Ogikubo Hospital, Tokyo, Japan.
Yuko
Y
Futei
Institute of Women's Health, Tokyo, Japan.|Department of Psychiatry, Tokyo Women's Medical University, Tokyo, Japan.
Toshiko
T
Kamo
Department of Dermatology and Wound Healing, Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK.|Department of Dermatology, Ashford and St Peter's Hospitals NHS Foundation Trust, Chertsey and Ashford, UK.
Mohammad Khurshid Azam
MKA
Basra
Department of Dermatology and Wound Healing, Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK.
Andrew Yule
AY
Finlay
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D005190:Family / Q000523:psychology*; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D007223:Infant; D007564:Japan; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D012871:Skin Diseases / Q000523:psychology*; D014177:Translations; D055815:Young Adult
Family Dermatology Life Quality Index; psychometric evaluations; quality of life; skin disease; validation