Validity and Reliability of an Expanded Vegetable Questionnaire Among Elementary School Children

M J Landry, N Ranjit, D M Hoelscher, F M Asigbee, S Vandyousefi, R Ghaddar, J N Davis, M J Landry, N Ranjit, D M Hoelscher, F M Asigbee, S Vandyousefi, R Ghaddar, J N Davis

Abstract

Background: The purpose of this study was to expand the School Physical Activity and Nutrition questionnaire to include a greater variety of vegetables and to evaluate the relative validity and reliability of these revised items.

Objectives: This study utilized 2 convenience samples of third to fifth graders for an analysis: validity (n = 70) and reliability (n = 76). Validity was assessed by comparing questionnaire items with vegetable intake reported from a 24-hour dietary recall covering the same reference period. Reliability estimates were assessed via same-day test-retest.

Results: Agreement correlations ranged from 0.35 to 0.71. Kappa statistics varied from 0.16 to 0.66. Percentage agreements ranged from 57% to 87%. Test-retest Spearman coefficients were greater than 0.50 for 6 items, weighted Kappa values were greater than 0.40 for all 7 items, and percentage agreement exceeded 75% for 5 items.

Conclusions: Results suggest that the questionnaire is a valid and reliable measure of the previous day's vegetable intake in third- to fifth-grade students. This trial was registered at ClinicalTrials.gov as NCT02668744.

Keywords: children; elementary; multiethnic; reliability; validity; vegetable intake; vegetable questionnaire.

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Source: PubMed

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