| dc.contributor.author | Moridpour, Amir Hossein | |
| dc.date.accessioned | 2023-06-19T06:57:30Z | |
| dc.date.available | 2023-06-19T06:57:30Z | |
| dc.date.issued | 2023 | en_US |
| dc.identifier.uri | https://dspace.tbzmed.ac.ir:443/xmlui/handle/123456789/68890 | |
| dc.description.abstract | : validity, reproducibility, food frequency questionnaire, calcium, vitamin D | en_US |
| dc.language.iso | fa | en_US |
| dc.publisher | Tabriz University of Medical Sciences School of Nutrition | en_US |
| dc.relation.isversionof | https://dspace.tbzmed.ac.ir:443/xmlui/handle/123456789/68889 | en_US |
| dc.subject | as an indicator of vitamin D status as a standard method. After one month, the FFQ was completed again to assess the reproducibility for all subjects. In the final stage, daily intake of calcium and vitamin D from FFQ (first time and second time) and 24-hour dietary recall questionnaires (average of 4 days) were estimated using N4 software, food composition table, and USDA table for each person separately. Study data were analyzed using Spearman's correlation coefficient, cross-classification analysis, Bland-Altman diagrams, Kappa weighted coefficient, and intraclass classification. Results: Spearman's correlation coefficient for calcium and vitamin D intake between FFQ1 and 24-hour food recalls and also between FFQ1 and vitamin D serum levels were significant (r: 0.959, r: 0.706, r: 0.682, respectively, P < 0.001 for All). Cross-classification for calcium and vitamin D between the two dietary methods (FFQ1 and 24-hour dietary recall) and between FFQ1 and vitamin D serum levels showed that most participants were in the same or adjacent quartiles in terms of calcium and vitamin D intake. The Bland-Altman plot for these two nutrients showed good agreement between the FFQ1 and 24-hour dietary recall methods. The weighted kappa coefficient for the agreement between the first (FFQ1) and second (FFQ2) questionnaires for calcium and vitamin D (to determine the reproducibility) was 0.638 and 0.18, respectively. Conclusion: The findings showed that the designed FFQ has acceptable validity for estimating calcium and vitamin D intake. The reproducibility of this questionnaire was higher for calcium than for vitamin D. Keywords: validity, reproducibility, food frequency questionnaire, calcium, vitamin D | en_US |
| dc.title | Validity and reliability of a semi-quantitative food frequency questionnaire for assessing dietary calcium and vitamin D intakes in Iranian childbearing age women | en_US |
| dc.type | Thesis | en_US |
| dc.contributor.supervisor | Rafraf, Maryam | |
| dc.identifier.docno | 110975 | en_US |
| dc.identifier.callno | 276/A/T | en_US |
| dc.description.discipline | Nutrition Sciences | en_US |
| dc.description.degree | M.S | en_US |
