title: Developing a Method to Test the Validity of 24 Hour Time Use Diaries Using Wearable Cameras: A Feasibility Pilot.
abstract: Self-report time use diaries collect a continuous sequenced record of daily activities but the validity of the data they produce is uncertain. This study tests the feasibility of using wearable cameras to generate, through image prompted interview, reconstructed 'near-objective' data to assess their validity. 16 volunteers completed the Harmonised European Time Use Survey (HETUS) diary and used an Autographer wearable camera (recording images at approximately 15 second intervals) for the waking hours of the same 24-hour period. Participants then completed an interview in which visual images were used as prompts to reconstruct a record of activities for comparison with the diary record. 14 participants complied with the full collection protocol. We compared time use and number of discrete activities from the diary and camera records (using 10 classifications of activity). In terms of aggregate totals of daily time use we found no significant difference between the diary and camera data. In terms of number of discrete activities, participants reported a mean of 19.2 activities per day in the diaries, while image prompted interviews revealed 41.1 activities per day. The visualisations of the individual activity sequences reveal some potentially important differences between the two record types, which will be explored at the next project stage. This study demonstrates the feasibility of using wearable cameras to reconstruct time use through image prompted interview in order to test the concurrent validity of 24-hour activity time-use budgets. In future we need a suitably powered study to assess the validity and reliability of 24-hour time use diaries.
authors.affiliation: Physical Activity for Health Research Centre, Institute for Sport, Physical Education and Health Sciences, University of Edinburgh, Edinburgh, United Kingdom.|British Heart Foundation Centre on Population Approaches for Non-Communicable Disease Prevention, Nuffield Department of Population Health, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Paul
authors.initials: P
authors.lastname: Kelly
authors.affiliation: British Heart Foundation Centre on Population Approaches for Non-Communicable Disease Prevention, Nuffield Department of Population Health, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Emma
authors.initials: E
authors.lastname: Thomas
authors.affiliation: British Heart Foundation Centre on Population Approaches for Non-Communicable Disease Prevention, Nuffield Department of Population Health, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Aiden
authors.initials: A
authors.lastname: Doherty
authors.affiliation: Centre for Time Use Research, Department of Sociology, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Teresa
authors.initials: T
authors.lastname: Harms
authors.affiliation: Nuffield Department of Population Health, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Órlaith
authors.initials: Ó
authors.lastname: Burke
authors.affiliation: Centre for Time Use Research, Department of Sociology, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Gershuny
authors.affiliation: British Heart Foundation Centre on Population Approaches for Non-Communicable Disease Prevention, Nuffield Department of Population Health, University of Oxford, Oxford, Oxfordshire, United Kingdom.
authors.forename: Charlie
authors.initials: C
authors.lastname: Foster
mesh_terms: D000328:Adult; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D015203:Reproducibility of Results; D057566:Self Report; D014741:Video Recording; D055815:Young Adult