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Open AccessArticle

Reliability of Self-Administered Questionnaire on Dietary Supplement Consumption in Malaysian Adolescents

1
Pharmacoepidemiology and Drug Safety Unit, Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras 56000, Kuala Lumpur, Malaysia
2
Centre for Healthy Ageing and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abd Aziz 50300, Kuala Lumpur, Malaysia
3
ProVice-Chancellor Office, Health Campus, Jalan Yaacob Latif, Bandar Tun Razak, Cheras 56000, Kuala Lumpur, Malaysia
4
Department of Pharmacology, Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Jalan Hospital, Sungai Buloh 47000, Malaysia
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(9), 2853; https://doi.org/10.3390/nu12092853
Received: 17 August 2020 / Revised: 15 September 2020 / Accepted: 16 September 2020 / Published: 17 September 2020
(This article belongs to the Special Issue Dietary Supplements and Human Health)
The repeatability of most questionnaires utilized in previous studies related to the consumption of dietary supplements (DS) among youth has not been well documented. Thus, a simple and easy-to-administer questionnaire to capture the habitual use of DS in the past one year known as the dietary supplement questionnaire (DiSQ) was developed and supported with external reliability evaluation. Analyses were done based on a convenience sample of 46 secondary school students. To elicit information regarding the intake of DS, the questionnaire was partitioned into two domains. The first domain was used to identify vitamin/mineral (VM) supplements, while the second domain was utilized to identify non-vitamin/non-mineral (NVNM) supplements. Cohen’s kappa coefficient (k) was used to evaluate the test–retest reliability of the questionnaire. Questionnaire administration to the respondents was done twice whereby a retest was given two weeks after the first test. Between test and retest, the reliability of individual items ranged from moderate to almost perfect for the VM (k = 0.53–1.00) and NVNM (k = 0.63–1.00) domains. None of the items had “fair” or ”poor” agreement. Various correlation coefficients can be obtained for the DiSQ but are generally reliable over time for assessing information on the consumption of supplements among the adolescent population. View Full-Text
Keywords: test–retest; nutritional supplement; vitamin; mineral; herbal; natural; botanical; nutraceutical test–retest; nutritional supplement; vitamin; mineral; herbal; natural; botanical; nutraceutical
MDPI and ACS Style

Zulfarina, M.S.; Sharif, R.; Sharkawi, A.M.; Tg Abu Bakar Sidik, T.M.I.; Mokhtar, S.-A.; Shuid, A.N.; Naina-Mohamed, I. Reliability of Self-Administered Questionnaire on Dietary Supplement Consumption in Malaysian Adolescents. Nutrients 2020, 12, 2853.

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