Journal
BRITISH JOURNAL OF NUTRITION
Volume 115, Issue 4, Pages 681-686Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007114515004821
Keywords
Diet; Internet; Dietary assessment; Acceptability
Categories
Funding
- Medical Research Council [MR/L023784/2] Funding Source: researchfish
- MRC [MR/L023784/2] Funding Source: UKRI
- Medical Research Council [MR/L023784/2] Funding Source: Medline
- Wellcome Trust [093707] Funding Source: Medline
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Although dietary intake over a single 24-h period may be atypical of an individual's habitual pattern, multiple 24-h dietary assessments can be representative of habitual intake and help in assessing seasonal variation. Web-based questionnaires are convenient for the participant and result in automatic data capture for study investigators. This study reports on the acceptability of repeated web-based administration of the Oxford WebQ - a 24-h recall of frequency from a set food list suitable for self-completion from which energy and nutrient values can be automatically generated. As part of the UK Biobank study, four invitations to complete the Oxford WebQ were sent by email over a 16-month period. Overall, 176 012 (53 % of those invited) participants completed the online version of the Oxford WebQ at least once and 66 % completed it more than once, although only 16 % completed it on all four occasions. The response rate for any one round of invitations varied between 34 and 26 %. On most occasions, the Oxford WebQ was completed on the same day that they received the invitation, although this was less likely if sent on a weekend. Participants who completed the Oxford WebQ tended to be white, female, slightly older, less deprived and more educated, which is typical of health-conscious volunteer-based studies. These findings provide preliminary evidence to suggest that repeated 24-h dietary assessment via the Internet is acceptable to the public and a feasible strategy for large population-based studies.
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