title: Assessing the Validity and Reproducibility of an Iron Dietary Intake Questionnaire Conducted in a Group of Young Polish Women.
abstract: The aim of the study was to analyse a designed brief iron dietary intake questionnaire based on a food frequency assessment (IRONIC-FFQ-IRON Intake Calculation-Food Frequency Questionnaire), including the assessment of validity and reproducibility in a group of 75 Polish women aged 20-30 years. Participants conducted 3-day dietary records and filled in the IRONIC-FFQ twice (FFQ1-directly after the dietary record and FFQ2-6 weeks later). The analysis included an assessment of validity (comparison with the results of the 3-day dietary record) and of reproducibility (comparison of the results obtained twice-FFQ1 and FFQ2). In the analysis of validity, the share of individuals correctly classified into tertiles was over 50% (weightedκof 0.36), while analysis of correlation revealed correlation coefficients of almost 0.5. In the assessment of reproducibility, almost 80% of individuals were correctly classified and less than 3% were misclassified (weightedκof 0.73), while a correlation coefficient higher than 0.85 was obtained. Both in the assessment of validity and of reproducibility, a Bland-Altman index of 6.7% was recorded (93.3% of compared pairs of results were in the acceptable range, attributed to differences within ± 2SD limit). Validation of the IRONIC-FFQ revealed a satisfactory level of validity and positively validated reproducibility.
authors.affiliation: Department of Dietetics, Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences (WULS-SGGW), 159c Nowoursynowska Str., 02-776 Warsaw, Poland. dominika_glabska@sggw.pl.
authors.forename: Dominika
authors.initials: D
authors.lastname: Głąbska
authors.affiliation: Department of Organization and Consumption Economics, Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences (WULS-SGGW), 159c Nowoursynowska Str., 02-776 Warsaw, Poland. dominika_guzek@sggw.pl.
authors.forename: Dominika
authors.initials: D
authors.lastname: Guzek
authors.affiliation: Department of Dietetics, Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences (WULS-SGGW), 159c Nowoursynowska Str., 02-776 Warsaw, Poland. joanna_slazak@sggw.pl.
authors.forename: Joanna
authors.initials: J
authors.lastname: Ślązak
authors.affiliation: Department of Dietetics, Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences (WULS-SGGW), 159c Nowoursynowska Str., 02-776 Warsaw, Poland. dariusz_wlodarek@sggw.pl.
authors.forename: Dariusz
authors.initials: D
authors.lastname: Włodarek
mesh_terms: D000328:Adult; D015930:Diet Records; D005260:Female; D006801:Humans; D019266:Iron, Dietary / Q000008:administration & dosage*; D015596:Nutrition Assessment; D010865:Pilot Projects; D011044:Poland; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D055815:Young Adult
chemical_list: D019266:Iron, Dietary
keywords: food frequency questionnaire; iron; reproducibility; validation study; validity; young women