Validation of Bangla Dermatology Life Quality Index among patients with psoriasis


  • Afroza Jesmin Department of Dermatology & Venereology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh.
  • Abida Sultana Department of Dermatology & Venereology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh.
  • Mohammed Saiful Islam Bhuiyan Department of Dermatology & Venereology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh.
  • S M Yasir Arafat Enam Medical College and Hospital


Bangla DLQI, psoriasis, reliability, validity


Background 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.  


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