Preverjanje vprašalnikov o pogostosti uživanja živil za oceno prehranskega vnosa vitamina D

Žlavs, Katarina (author), Pravst, Igor (mentor)

Za uveljavljanje strategij za preprečevanje pomanjkanja vitamina D, ki je eden večjih prepoznanih javno-zdravstvenih problemov, je ključnega pomena ocena vnosa vitamina D s prehrano. Prehranski vnos vitamina D je najbolj enostavno oceniti z vprašalnikom o pogostosti uživanja živil (VPŽ), ki mora biti prilagojen ciljni populaciji in predhodno validiran. Namen magistrskega dela je raziskati primernost metode določanja prehranskega vnosa vitamina D z VPŽ. Analizirali smo semikvantitativen VPŽ, ki ga je 54 odraslih prebivalcev Slovenije izpolnilo dvakrat z razmikom 6 tednov, medtem pa so vodili petdnevni prehranski dnevnik (PD5). Cilj raziskave je bil primerjati prehranski vnos vitamina D, določen s semikvantitativnim VPŽ in s standardno metodo PD5, ter tako oceniti zanesljivost semikvantitativnega VPŽ ter primerjati prehranski vnos, določen z dvema semikvantitativnima VPŽ, izpolnjenima s 6-tedenskim zamikom, in s tem preveriti ponovljivost semikvantitativnega VPŽ. Zanesljivost in ponovljivost smo preverjali z ugotavljanjem standardnih napak, srednjih vrednosti in statistično značilnih korelacij. Glede na rezultate določanja prehranskega vnosa vitamina D smo ugotovili pozitivno korelacijo med prehranskim vnosom, določenim z VPŽ in PD5. Močnejšo korelacijo smo ugotovili med prehranskim vnosom, določenim z dvema VPŽ s časovnim razmikom. Ugotovili smo, da testiran semikvantitativen VPŽ za določanje prehranskega vnosa vitamina D daje zanesljive in ponovljive rezultate in je tako primeren za uporabo pri ocenjevanju prehranskega vnosa vitamina D pri odraslih prebivalcih Slovenije. Metoda ponuja možnosti za optimizacijo testiranega VPŽ za doseganje še boljše zanesljivosti.

• Language: Slovenian
• Keywords: prehrana, prehranski vnos, vitamin D, vprašalnik o pogostosti uživanja živil, preverjanje zanesljivosti, preverjanje ponovljivosti, prehranski dnevnik
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [K. Žlavs]
• Year: 2020
• PID: 20.500.12556/RUL-122369
• UDC: 613.2:577.161.2
• COBISS.SI-ID: 42549763
• Publication date in RUL: 05.12.2020

ŽLAVS, Katarina, 2020, Preverjanje vprašalnikov o pogostosti uživanja živil za oceno prehranskega vnosa vitamina D [online]. Master’s thesis. K. Žlavs. [Accessed 15 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=122369

Secondary language

• Language: English
• Title: Validation of food frequency questionnaires for the assessment of dietary vitamin D intake

Abstract

Due to the inadequate intake of vitamin D as one of the main identified public health problems, an assessment of dietary intake of vitamin D is crucial. The intake can be easily assessed by the food frequency questionnaire (FFQ) which should be developed to be administered among the intended target population and thus validated at the outset. This Master’s thesis examined the suitability of the FFQ as one of the methods for the assessment of the dietary intake of vitamin D. We analyzed a semiquantitative FFQ, which has been filled out by 54 Slovenian adults at the beginning of the study and once again after 6 weeks, as well as a five-day dietary record (DR5) that they had kept during these 6 weeks. In order to assess the validity of the semiquantitative FFQ we compared the results of the semiquantitative FFQ with those of the gold standard method of DR5. In addition to this, we compared a dietary vitamin D intake determined by two semiquantitative FFQs, administered with the test-retest interval of 6 weeks, in order to assess the reproducibility of the semiquantitative FFQ. The assessment of validity and reproducibility was conducted by examining the standard error, median differences and correlations. The results revealed positive correlation that confirms the validity and reproducibility of the questionnaire. The correlation between the FFQs administered two times was stronger than the correlation between the FFQ and DR5. The study confirmed that the results provided by the semiquantitative FFQ are accurate. However, this method could be optimized in the future studies to further improve its reliability. The analyzed semiquantitative FFQ may be adjusted as a simple tool to assess vitamin D intake among the Slovenian adult population.

• Keywords: nutrition, dietary assessment, vitamin D, food frequency questionnaire, validity assessment, reproducibility assessment, food record