| Titre : | Reliability and validity of self-report of vitamin and mineral supplement use in the vitamins and lifestyle study. (2003) |
| Auteurs : | Jessie SATIA-ABOUTA ; Irena-B KING ; Alan-R KRISTAL ; Ruth-E PATTERSON ; John-D POTTER ; Ann-L SHATTUCK ; Kayla-L STRATTON ; Mark-D THORNQUIST ; Emily White ; Fred Hutchinson Cancer Research Center. Cancer Prevention Research Program. Seattle. WA. USA |
| Type de document : | Article |
| Dans : | American journal of epidemiology (vol. 157, n° 10, 2003) |
| Pagination : | 944-954 |
| Langues: | Anglais |
| Mots-clés : | Fiabilité ; Validité ; Vitamine ; Questionnaire ; Homme |
| Résumé : | [BDSP. Notice produite par INIST-CNRS e9iR0xWP. Diffusion soumise à autorisation]. In the United States, dietary supplements contribute a large proportion of micronutrient intakes. Therefore, it is important to collect accurate information on supplement use for studies of micronutrients and disease risk. This report describes the test-retest reliability and validity of a detailed, self-administered mailed questionnaire on vitamin and mineral supplement use. Participants (n=220) completed the questionnaire at baseline and 3 months later. During an in-person interview, participants provided spot urine and blood samples, and interviewers transcribed nutrient information from their supplement bottle labels. The questionnaire had very good test-retest reliability for mean supplement intake over the past 10 years, with intraclass correlations ranging from 0.69 for beta-carotene to 0.87 for vitamin E. Pearson's correlation coefficients comparing current supplemental intakes from the questionnaire and interviews/label transcriptions were high, ranging from 0.58 for beta-carotene to 0.82 for chromium ; however, for some nutrients, median intakes from the questionnaire were slightly lower than from the interviews. Beta-carotene, vitamin C, and vitamin E (alpha-tocopherol) showed clear linear trends of increasing blood concentrations with higher self-reported supplemental intakes (Pearson's correlation coefficients adjusted for potential confounding factors and diet=0.31,0.29, and 0.69, respectively ; all p<0.0001). Creatinine-adjusted spot urinary calcium values were not associated with supplemental calcium intakes (Pearson's r=-0.07). This self-administered questionnaire demonstrated high reproducibility and validity for collecting detailed information on supplement use. |
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