Validation of Bangla Dermatology Life Quality Index among patients with psoriasis
Keywords:Bangla DLQI, psoriasis, reliability, validity
AbstractBackground Psoriasis is a chronic skin disease that affects the quality of life significantly. The effect of dermatological disease on patients’ quality of life is a minimally addressed issue in Bangladesh due to the unavailability of a standardized measuring tool. This study aimed to validate the Bangla version of the Dermatology Life Quality Index. Methods This validation study was conducted between September 2016 and August 2017. 80 patients with psoriasis were interviewed by the Bangla version of the Dermatology Life Quality Index. The cultural adaptation was ensured by performing the standard forward-backward translation procedure. Reliability was estimated by internal consistency using Cronbach’s alpha & test-retest reliability was assessed by the intra-class coefficient. Different forms of validity were assessed. Results The scale demonstrated Cronbach’s alpha 0.86 and significant test-retest reliability (ICC= 0.97). Construct validity assessing Factor Analysis-Principal Component Analysis with the distribution of varimax rotation of DLQI Bangla ranged from 0.41 to 0.83. There was only one component extracted by principal component analysis with varimax rotation. Face validity, content validity, convergent validity, and criterion validity were found acceptable. Conclusion The adapted Bangla version of DLQI appears to be an acceptable, reliable, and valid instrument for measuring the quality of life in Bangla speaking patients with psoriasis.
World Health Organization. Global report on Psoriasis. 2016. Geneva, Switzerland. https://apps.who.int/iris/bitstream/handle/10665/204417/9789241565189_eng.pdf.psoriasis;jsessionid=54912784D28C9F36ECCD45471AC5775B?sequence=1 (accessed on 25 Aug 2020).
Manjula VD, Sreekiran S, Saril PS, Sreekanth MP. A study of psoriasis and quality of life in a tertiary care teaching hospital of Kottayam, Kerala. Indian J Dermatol. 2011; 56(4): 403.
De Arruda LH, De Moraes AP. The impact of psoriasis on quality of life. Br. J. Dermatol. 2001; 144: 33-36.
Rapp SR, Feld SR, Exurn ML, Fleischer AB, REboussin DNL. Psoriasis causes much disability as other major medical diseases. JAAD 1999; 41: 401-404.
Kruger G, Koo J, Lebwohl M. The impact of psoriasis on quality of life. Arch. Dermatol. 2001; 137: 280-284.
Fredricsson T, Pettersson U. Severe psoriasis-oral therapy with a new retinoid. Dermatologica 1978; 157: 238-244.
Finlay AY. Current severe psoriasis and the rule of tens. Br. J. Dermatol. 2005; 152: 861-867.
Finlay AY, Khan GK. Dermatology Life Quality Index (DLQI)-A simple practical measure for routine clinical use. Clin Exp Dermatol. 1994; 19: 210-216.
Ashcroft DM, LiwanPoA, Williams HC, Griffth CE. Quality of life measures in psoriasis: a clinical appraisal of their quality. Br. J. Dermatol. 1999; 141: 185-191.
Arafat SMY, Chowdhury HR, Qusar MMA, Hafez MA. Cross Cultural Adaptation & Psychometric Validation of research instruments: A methodological review. J Behav Health 2016; 5: 129-136.
Beaton D, Drocas E, Bombardier C, Gulleemin F, Ferraz MB. Guidelines for the process of cross-cultural adaptation of self-report measures. Spine 2000; 25: 3186-3191.
Feroz AH, Islam MN, Hasan M, ten Klooster PM, Rasker JJ, Haq SA. The Bengali Short Form-36 was acceptable, reliable, and valid in patients with rheumatoid arthritis. J Clin Epidemiol. 2012; 65: 1227-1235.
Basra MKA, Fenech R, Gait RM. The Dermatology Life Quality Index, a comprehensive review of validation data and clinical results. Br. J. Dermatol. 2008; 159: 997-1035.
Madarasingha NP, Silva Pde, Satgurunathan k. Validation of Sinhala version of the dermatology life quality index (DLQI). Ceylon Med J. 2011; 56: 18-22.
Mazzotti E, Barbaranelli C, Picardi A, Abeni D, Pasquini P. Psychometric properties of the DLQI in 900 Italian patients with psoriasis 2005. Acta Derm. Venereol. 2005; 85: 409-413.
He Z, Lu C, Basra MKA et al. Psychometric properties of the Chinese version of dermatology life quality index (DLQI) in 851 Chinese patients with psoriasis. J. Eur. Acad. Dermatol. 2013; 27: 109-115.
Takahashi N, Suzukamo Y, Nakamura M et al. Japanese version of the Dermatology Life Quality Index: validity and reliability in patients with acne. Health Qual Life Outcomes 2006; 4: 46.
Ozturkan S, Emerctan AT, Eser E, Sahin MT. Crosss validation of the Turkish version of dermatology life quality index. Int J Dermatol. 2006;45(11):1300-7.
Mork C, Wahl A, Moum T. The Norwegian Version of the Dermatology Life Quality Index: a Study of Validity and Reliability in Psoriatics. Acta Derm. Venereol. 2002; 82: 347-351.
Nijsten T, Meads DM, McKenna SP. Dimensionality of the Dermatology Life Quality Index (DLQI): A Commentary. Acta Derm. Venereol. 2006; 86.