Psychometric properties of the Persian version of the celiac disease adherence test questionnaire
Abstract Background A gluten-free diet (GFD) is the only effective treatment for celiac patients and assessing adherence to this diet is important. Celiac disease Adherence Test (CDAT) is a valid English-language questionnaire that is used for assessing the adherence to the GFD. In the present study...
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| Format: | Article |
| Language: | English |
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BMC
2020-07-01
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| Series: | BMC Gastroenterology |
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| Online Access: | http://link.springer.com/article/10.1186/s12876-020-01396-8 |
| _version_ | 1818313751743430656 |
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| author | Zeinab Nikniaz Mohammad Asghari Jafarabadi Saeideh Ghaffarifar Zahra Saeedi Zahra Akbari Namvar Masood Shirmohammadi |
| author_facet | Zeinab Nikniaz Mohammad Asghari Jafarabadi Saeideh Ghaffarifar Zahra Saeedi Zahra Akbari Namvar Masood Shirmohammadi |
| author_sort | Zeinab Nikniaz |
| collection | DOAJ |
| description | Abstract Background A gluten-free diet (GFD) is the only effective treatment for celiac patients and assessing adherence to this diet is important. Celiac disease Adherence Test (CDAT) is a valid English-language questionnaire that is used for assessing the adherence to the GFD. In the present study, we aimed to translate the CDAT questionnaire in Persian and evaluate its validity and reliability. Methods In the present cross-sectional study, CDAT was translated and back-translated by three bilingual professional translators. Content validity was evaluated by 12 gastroenterologists and nutritionists. To assess the construct validity, 230 patients with celiac disease were randomly selected from the national celiac disease registry database. Internal consistency of the items and test-retest reliability were assessed by Cronbach’s alpha and Intraclass Correlation Coefficient (ICC). To assess the convergent validity of the questionnaire, the correlation coefficient between the CDAT score and anti-tissue transglutaminase immunoglobulin A (anti-t-TG-IgA) titer was assessed. Results The content validity index, content validity ratio, and impact score of the Persian version of CDAT (Pv-CDAT) were 0.97, 0.95, and 4.61 respectively. Three significant factors were extracted and according to the confirmatory factor analysis the three-factor model had adequate fitness (chi-square p-value of 0.74, root mean error of approximation: 0.001 [95% CI: 0.001–0.083], comparative fit index: 1, standardized root mean squared residual: 0.04, and coefficient of determination: 0.78). The questionnaire had good feasibility with the floor effect of 3.1% and the ceiling effect of 0.4%. Moreover, it has high internal consistency (Cronbach-alpha: 0.71) and test-retest reliability (ICC: 0.78). The correlations between CDAT categories and anti-tTG-IgA categories showed a significant correlation between the two tests (r = 0.53; P < 0.001). Conclusions The results of the present study showed that the Pv-CDAT questionnaire with high validity, reliability, and internal consistency can be used for assessing adherence to the GFD in adult celiac patients in Iran. |
| first_indexed | 2024-12-13T08:38:44Z |
| format | Article |
| id | doaj.art-81d8348849524b77b7e797a9285fcafd |
| institution | Directory Open Access Journal |
| issn | 1471-230X |
| language | English |
| last_indexed | 2024-12-13T08:38:44Z |
| publishDate | 2020-07-01 |
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| series | BMC Gastroenterology |
| spelling | doaj.art-81d8348849524b77b7e797a9285fcafd2022-12-21T23:53:35ZengBMCBMC Gastroenterology1471-230X2020-07-012011610.1186/s12876-020-01396-8Psychometric properties of the Persian version of the celiac disease adherence test questionnaireZeinab Nikniaz0Mohammad Asghari Jafarabadi1Saeideh Ghaffarifar2Zahra Saeedi3Zahra Akbari Namvar4Masood Shirmohammadi5Liver and gastrointestinal diseases research center, Tabriz University of medical sciencesRoad Traffic Injury Research Center, Department of Epidemiology and Biostatistics, Faculty of Health, Tabriz University of Medical SciencesMedical Education Research Centre, Health Management and Safety Promotion Research Institute, Tabriz University of Medical SciencesStudent research committee, Tabriz University of medical sciencesStudent research committee, Tabriz University of medical sciencesLiver and gastrointestinal diseases research center, Tabriz University of medical sciencesAbstract Background A gluten-free diet (GFD) is the only effective treatment for celiac patients and assessing adherence to this diet is important. Celiac disease Adherence Test (CDAT) is a valid English-language questionnaire that is used for assessing the adherence to the GFD. In the present study, we aimed to translate the CDAT questionnaire in Persian and evaluate its validity and reliability. Methods In the present cross-sectional study, CDAT was translated and back-translated by three bilingual professional translators. Content validity was evaluated by 12 gastroenterologists and nutritionists. To assess the construct validity, 230 patients with celiac disease were randomly selected from the national celiac disease registry database. Internal consistency of the items and test-retest reliability were assessed by Cronbach’s alpha and Intraclass Correlation Coefficient (ICC). To assess the convergent validity of the questionnaire, the correlation coefficient between the CDAT score and anti-tissue transglutaminase immunoglobulin A (anti-t-TG-IgA) titer was assessed. Results The content validity index, content validity ratio, and impact score of the Persian version of CDAT (Pv-CDAT) were 0.97, 0.95, and 4.61 respectively. Three significant factors were extracted and according to the confirmatory factor analysis the three-factor model had adequate fitness (chi-square p-value of 0.74, root mean error of approximation: 0.001 [95% CI: 0.001–0.083], comparative fit index: 1, standardized root mean squared residual: 0.04, and coefficient of determination: 0.78). The questionnaire had good feasibility with the floor effect of 3.1% and the ceiling effect of 0.4%. Moreover, it has high internal consistency (Cronbach-alpha: 0.71) and test-retest reliability (ICC: 0.78). The correlations between CDAT categories and anti-tTG-IgA categories showed a significant correlation between the two tests (r = 0.53; P < 0.001). Conclusions The results of the present study showed that the Pv-CDAT questionnaire with high validity, reliability, and internal consistency can be used for assessing adherence to the GFD in adult celiac patients in Iran.http://link.springer.com/article/10.1186/s12876-020-01396-8Celiac diseaseGluten-free dietAdherenceCDATValidationPersian |
| spellingShingle | Zeinab Nikniaz Mohammad Asghari Jafarabadi Saeideh Ghaffarifar Zahra Saeedi Zahra Akbari Namvar Masood Shirmohammadi Psychometric properties of the Persian version of the celiac disease adherence test questionnaire BMC Gastroenterology Celiac disease Gluten-free diet Adherence CDAT Validation Persian |
| title | Psychometric properties of the Persian version of the celiac disease adherence test questionnaire |
| title_full | Psychometric properties of the Persian version of the celiac disease adherence test questionnaire |
| title_fullStr | Psychometric properties of the Persian version of the celiac disease adherence test questionnaire |
| title_full_unstemmed | Psychometric properties of the Persian version of the celiac disease adherence test questionnaire |
| title_short | Psychometric properties of the Persian version of the celiac disease adherence test questionnaire |
| title_sort | psychometric properties of the persian version of the celiac disease adherence test questionnaire |
| topic | Celiac disease Gluten-free diet Adherence CDAT Validation Persian |
| url | http://link.springer.com/article/10.1186/s12876-020-01396-8 |
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