Validity and Reliability of General Nutrition Knowledge Questionnaire for Adults in Uganda
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Nutrients,
Abstract
This study sought to develop and validate a general nutrition knowledge questionnaire
(GNKQ) for Ugandan adults. The initial draft consisted of 133 items on five constructs associated
with nutrition knowledge; expert recommendations (16 items), food groups (70 items), selecting food
(10 items), nutrition and disease relationship (23 items), and food fortification in Uganda (14 items).
The questionnaire validity was evaluated in three studies. For the content validity (study 1), a panel of
five content matter nutrition experts reviewed the GNKQ draft before and after face validity. For the
face validity (study 2), head teachers and health workers (n = 27) completed the questionnaire before
attending one of three focus groups to review the clarity of the items. For the construct and test-rest
reliability (study 3), head teachers (n = 40) from private and public primary schools and nutrition
(n = 52) and engineering (n = 49) students from Makerere University took the questionnaire twice (two
weeks apart). Experts agreed (content validity index, CVI > 0.9; reliability, Gwet’s AC1 > 0.85) that
all constructs were relevant to evaluate nutrition knowledge. After the focus groups, 29 items were
identified as unclear, requiring major (n = 5) and minor (n = 24) reviews. The final questionnaire had
acceptable internal consistency (Cronbach > 0.95), test-retest reliability (r = 0.89), and differentiated
(p < 0.001) nutrition knowledge scores between nutrition (67 5) and engineering (39 11) students.
Only the construct on nutrition recommendations was unreliable (Cronbach = 0.51, test-retest
r = 0.55), which requires further optimization. The final questionnaire included topics on food groups
(41 items), selecting food (2 items), nutrition and disease relationship (14 items), and food fortification
in Uganda (22 items) and had good content, construct, and test-retest reliability to evaluate nutrition
knowledge among Ugandan adults.
Description
Keywords
nutrition knowledge questionnaire, validation, Uganda, adults
Citation
Bukenya, R., Ahmed, A., Andrade, J. M., Grigsby-Toussaint, D. S., Muyonga, J., & Andrade, J. E. (2017). Validity and reliability of general nutrition knowledge questionnaire for adults in Uganda. Nutrients, 9(2), 172.doi:10.3390/nu9020172