Vitamin D Dietary Intake Questionnaire Validation Conducted among Young Polish Women

Abstract

Due to inadequate intake of Vitamin D, identification of individuals characterised by the highest risk of deficiencies is one of the more crucial tasks for public health. The aim of the presented study was to assess the validity and reproducibility of the designed Vitamin D dietary intake questionnaire based on food frequency assessment—VIDEO-FFQ (VItamin D Estimation Only—Food Frequency Questionnaire) in a group of Polish women aged 20–30 years. Seventy-five participants kept a three-day dietary record and filled out the VIDEO-FFQ twice (immediately after the three-day dietary record and after six weeks). The assessment of validity and reproducibility was conducted by verifying standard errors of estimation, median differences, and percentages of individuals classified into tertiles, correlations and Bland-Altman plots. The Vitamin D intake for the majority of the surveyed women was inadequate as over 85% of them were characterised by values of intake lower than 5.0 μg per day. The results allowed concluding that a high accuracy of the VIDEO-FFQ was achieved. The required Bland-Altman index values lower than 5.0% were obtained, confirming satisfactory validity and reproducibility. The VIDEO-FFQ may be deemed a convenient practical tool for the estimation of Vitamin D intake in young women.

Assessing the Validity and Reproducibility of an Iron Dietary Intake Questionnaire Conducted in a Group of Young Polish Women

“…For the preconceived conditions, the minimum sample size was calculated as 35 individuals. The sampling procedure for validation was conducted as for the previous paper, while the number of participants was at an equal level [23]. …”

“…Validation of the obtained IRONIC-FFQ questionnaire was conducted according to methodology published previously [23]. It included an analysis of the validity (external validation comparing results of the FFQ1 with results of the 3-day dietary record, whereas both assessments were conducted by the same researcher) and reproducibility of the method (internal validation comparing results obtained twice—FFQ1 and FFQ2, with both assessments conducted by the same researcher), as defined by Willett and Lenart [26].…”

The Effect of an Iron Supplement on Lycopene Metabolism and Absorption During Digestion in Healthy Humans

“…Higher intakes of LYC have been associated with a reduced fecal blood, mucus, and pus in subjects with ulcerative colitis in remission. [15] Likewise, animal studies of colitis have demonstrated a reduction in myeloperoxidase, a marker of colon inflammation, after LYC administration both with [16] or without [17] iron. One plausible mechanism of action is that LYC acts directly to protect the gastrointestinal lumen.…”

Development and validation of the semi‐quantitative brief food frequency questionnaire to assess the magnesium intake in young women

“…The study included the development of the semiquantitative brief FFQ to assess the magnesium intake (Mg-FFQ) and validation of the obtained FFQ in the Polish population of young women that was conducted using the same methodology as for previously developed brief FFQs for minerals [18][19][20] and vitamins. 21,22 The study was conducted according to the guidelines laid down in the Declaration of Helsinki, and all participants provided their informed consent to participate. All the procedures were approved by the Bioethical Commission of the National Food and Nutrition Institute in Warsaw (No.…”