Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study
Introduction: The Psoriasis Disability Index (PDI) is a pre-validated, self-administered questionnaire assessing quality of life in adults suffering from psoriasis. The English version contains 15 items measuring five components – activities, work/school performance, personal, leisure, and treatment...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2020-01-01
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| Series: | Journal of Dermatology and Dermatologic Surgery |
| Subjects: | |
| Online Access: | http://www.jddsjournal.org/article.asp?issn=2352-2410;year=2020;volume=24;issue=1;spage=25;epage=32;aulast=Mir |
| _version_ | 1818256849928978432 |
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| author | Anaitulah Ahmad Mir Abhijit Chattopadhyay Jaytilak Pramanick Ashish Gautam Showkat Ahmad Mir Munmun Koley Subhranil Saha |
| author_facet | Anaitulah Ahmad Mir Abhijit Chattopadhyay Jaytilak Pramanick Ashish Gautam Showkat Ahmad Mir Munmun Koley Subhranil Saha |
| author_sort | Anaitulah Ahmad Mir |
| collection | DOAJ |
| description | Introduction: The Psoriasis Disability Index (PDI) is a pre-validated, self-administered questionnaire assessing quality of life in adults suffering from psoriasis. The English version contains 15 items measuring five components – activities, work/school performance, personal, leisure, and treatment. Purpose: We aimed to translate the PDI into Bengali and examine its psychometric properties. Methods: The PDI-Bengali version (PDI-B) was produced by standardized forward-backward translations. A cross-sectional study was conducted to gather responses by consecutive sampling. Reliability was tested using internal consistency and test-retest reliability analyses, concurrent validity by comparing with Psoriasis Area and Severity Index (PASI) and Dermatological Life Quality Index scores, while construct validity by exploratory factor analysis (n= 83) using principal component analysis (varimax rotation). Subsequently, confirmatory factor analysis (CFA; n = 85) was performed to verify the a priori scales by the goodness of fit model. Results: The internal consistency (Cronbach's alpha) and the intra-class correlation coefficients were 0.877 and 0.882, respectively. Acceptable values of internal consistency, test-retest reliability, and concurrent validity were found. All the items loaded above the pre-specified value of 0.4. Factor analyses using Varimax identified three components (social activities, concern, and personal activities) explaining 56.8% of the variation. The Kaiser-Meyer-Olkin was 0.836 and Bartlett's test of sphericity was P < 0.001. The goodness of fit of CFA model was excellent. Conclusion: The PDI-B, consisting of 15 items and framed within three components, is a valid and reliable questionnaire, but measured different dimensions from the English version. |
| first_indexed | 2024-12-12T17:34:18Z |
| format | Article |
| id | doaj.art-bd3dd3666e644133809efb1b01371dfe |
| institution | Directory Open Access Journal |
| issn | 2352-2410 2352-2429 |
| language | English |
| last_indexed | 2024-12-12T17:34:18Z |
| publishDate | 2020-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
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| series | Journal of Dermatology and Dermatologic Surgery |
| spelling | doaj.art-bd3dd3666e644133809efb1b01371dfe2022-12-22T00:17:16ZengWolters Kluwer Medknow PublicationsJournal of Dermatology and Dermatologic Surgery2352-24102352-24292020-01-01241253210.4103/jdds.jdds_38_19Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional studyAnaitulah Ahmad MirAbhijit ChattopadhyayJaytilak PramanickAshish GautamShowkat Ahmad MirMunmun KoleySubhranil SahaIntroduction: The Psoriasis Disability Index (PDI) is a pre-validated, self-administered questionnaire assessing quality of life in adults suffering from psoriasis. The English version contains 15 items measuring five components – activities, work/school performance, personal, leisure, and treatment. Purpose: We aimed to translate the PDI into Bengali and examine its psychometric properties. Methods: The PDI-Bengali version (PDI-B) was produced by standardized forward-backward translations. A cross-sectional study was conducted to gather responses by consecutive sampling. Reliability was tested using internal consistency and test-retest reliability analyses, concurrent validity by comparing with Psoriasis Area and Severity Index (PASI) and Dermatological Life Quality Index scores, while construct validity by exploratory factor analysis (n= 83) using principal component analysis (varimax rotation). Subsequently, confirmatory factor analysis (CFA; n = 85) was performed to verify the a priori scales by the goodness of fit model. Results: The internal consistency (Cronbach's alpha) and the intra-class correlation coefficients were 0.877 and 0.882, respectively. Acceptable values of internal consistency, test-retest reliability, and concurrent validity were found. All the items loaded above the pre-specified value of 0.4. Factor analyses using Varimax identified three components (social activities, concern, and personal activities) explaining 56.8% of the variation. The Kaiser-Meyer-Olkin was 0.836 and Bartlett's test of sphericity was P < 0.001. The goodness of fit of CFA model was excellent. Conclusion: The PDI-B, consisting of 15 items and framed within three components, is a valid and reliable questionnaire, but measured different dimensions from the English version.http://www.jddsjournal.org/article.asp?issn=2352-2410;year=2020;volume=24;issue=1;spage=25;epage=32;aulast=Mirconfirmatory factor analysisprincipal component analysispsoriasis disability indexreliabilityvalidity |
| spellingShingle | Anaitulah Ahmad Mir Abhijit Chattopadhyay Jaytilak Pramanick Ashish Gautam Showkat Ahmad Mir Munmun Koley Subhranil Saha Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study Journal of Dermatology and Dermatologic Surgery confirmatory factor analysis principal component analysis psoriasis disability index reliability validity |
| title | Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study |
| title_full | Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study |
| title_fullStr | Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study |
| title_full_unstemmed | Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study |
| title_short | Psychometric validation of the psoriasis disability index questionnaire (Translated Bengali Version): A cross-sectional study |
| title_sort | psychometric validation of the psoriasis disability index questionnaire translated bengali version a cross sectional study |
| topic | confirmatory factor analysis principal component analysis psoriasis disability index reliability validity |
| url | http://www.jddsjournal.org/article.asp?issn=2352-2410;year=2020;volume=24;issue=1;spage=25;epage=32;aulast=Mir |
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