title: The acceptability of repeat Internet-based hybrid diet assessment of previous 24-h dietary intake: administration of the Oxford WebQ in UK Biobank.
abstract: 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.
authors.affiliation: 1Cochrane Institute of Primary Care and Public Health,Cardiff University,5th Floor,Neuadd Meirionnydd,Heath Park,Cardiff CF14 4YS,UK.
authors.forename: Julieta
authors.identifier: http://orcid.org/0000-0002-4108-5341
authors.initials: J
authors.lastname: Galante
authors.affiliation: 2Clinical Trial Service Unit and Epidemiological Studies Unit,Nuffield Department of Population Health,University of Oxford,Richard Doll Building,Old Road Campus,Roosevelt Drive,Oxford OX3 7LF,UK.
authors.forename: Ligia
authors.initials: L
authors.lastname: Adamska
authors.affiliation: 2Clinical Trial Service Unit and Epidemiological Studies Unit,Nuffield Department of Population Health,University of Oxford,Richard Doll Building,Old Road Campus,Roosevelt Drive,Oxford OX3 7LF,UK.
authors.forename: Alan
authors.initials: A
authors.lastname: Young
authors.affiliation: 3Cancer Epidemiology Unit,Nuffield Department of Population Health,University of Oxford,Richard Doll Building,Old Road Campus,Roosevelt Drive,Oxford OX3 7LF,UK.
authors.forename: Heather
authors.initials: H
authors.lastname: Young
authors.affiliation: 2Clinical Trial Service Unit and Epidemiological Studies Unit,Nuffield Department of Population Health,University of Oxford,Richard Doll Building,Old Road Campus,Roosevelt Drive,Oxford OX3 7LF,UK.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Littlejohns
authors.affiliation: 1Cochrane Institute of Primary Care and Public Health,Cardiff University,5th Floor,Neuadd Meirionnydd,Heath Park,Cardiff CF14 4YS,UK.
authors.forename: John
authors.initials: J
authors.lastname: Gallacher
authors.affiliation: 2Clinical Trial Service Unit and Epidemiological Studies Unit,Nuffield Department of Population Health,University of Oxford,Richard Doll Building,Old Road Campus,Roosevelt Drive,Oxford OX3 7LF,UK.
authors.forename: Naomi
authors.initials: N
authors.lastname: Allen
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D015331:Cohort Studies; D004032:Diet / Q000009:adverse effects*; D004522:Educational Status; D034742:Electronic Mail; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D015596:Nutrition Assessment; D009749:Nutrition Surveys / Q000379:methods*; D057240:Patient Preference; D011446:Prospective Studies; D057566:Self Report; D012727:Sex Characteristics; D006113:United Kingdom
keywords: Acceptability; Diet; Dietary assessment; Internet