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Public Health Nutr. 2019 Mar;22(3):419-430. doi: 10.1017/S1368980018003269. Epub 2018 Dec 3.

Measuring nutritional knowledge using Item Response Theory and its validity in European adolescents.

Author information

1
1Public Health Faculty,University of São Paulo,Av. Dr Arnaldo 715, Cerqueira César, São Paulo - SP, 01246-904,Brazil.
2
2Growth, Exercise, NUtrition and Development (GENUD) Research Group,Universidad de Zaragoza,Instituto Agroalimentario de Aragón (IA2), Instituto de Investigación Sanitaria de Aragón (IIS Aragón) and Centro de Investigación Biomédica en Red de Fisiopatología de la Nutrición y la Obesidad (CIBEROBN), Zaragoza,Spain.
3
3Department of Informatics and Statistics,Federal University of Santa Catarina,Florianópolis, SC,Brazil.
4
4Council for Agricultural Research and Economics,Research Centre for Food and Nutrition,Rome,Italy.
5
5Department of Health and Human Performance,Universidad Politécnica de Madrid,Centro de Investigación Biomédica en Red de Fisiopatología de la Nutrición y la Obesidad (CIBEROBN), Madrid,Spain.
6
6Department of Pediatrics, Regional Hospital Center,University of Lille,Lille,France.
7
7Department of Nutrition and Dietetics, School of Health Sciences and Education,Harokopio University,Athens,Greece.
8
8Research Department of Child Nutrition,Pediatric University Clinic,Bochum,Germany.
9
9Department of Public Health,Ghent University,Ghent,Belgium.
10
10Nutritional Epidemiology Group (NEP), International Agency for Research on Cancer, Lyon,France.
11
11Division of Nutrition and Metabolism, Department of Pediatrics,Medical University of Vienna,Vienna,Austria.
12
12Department of Pediatrics,University of Pécs Medical School,Pécs,Hungary.
13
13Institute of Food Science, Technology and Nutrition, Spanish National Research Council (ICTAN-CSIC),Madrid,Spain.
14
14Department of Physiology, Medicine School,University of Granada,Granada,Spain.

Abstract

OBJECTIVE:

To analyse the Nutritional Knowledge Test (NKT) using Item Response Theory (ITR) analysis and to assess the construct validity of the Nutritional Knowledge Scale (NKTS) and its associations with adolescent food group consumption and nutritional biomarkers.

DESIGN:

Cross-sectional study.

SETTING:

Multicentre investigation conducted in ten European cities.ParticipantsAdolescents aged 12·5-17·5 years (n 3215) who completed over 75 % of the NKT.

RESULTS:

Factor analysis indicated that the NKT can be analysed with a one-dimensional model. Eleven out of twenty-three items from the NKT presented adequate parameters and were selected to be included in the NKTS. Nutrition knowledge was positively associated with consumption of fruits, cereals, dairy products, pulses, meat and eggs, and fish, as well as with blood concentrations of vitamin C, β-carotene, n-3 fatty acids, holo-transcobalamin, cobalamin and folate; nutrition knowledge was negatively associated with intake of olives and avocado, alcohol and savoury snacks.

CONCLUSIONS:

The NKTS assessed nutritional knowledge adequately and it is proposed as a new tool to investigate this subject in future studies.

KEYWORDS:

Diet; Knowledge; Nutrition; Psychometrics; Scales

PMID:
30501683
DOI:
10.1017/S1368980018003269

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