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Title: Can a single question provide an accurate measure of physical activity?
Authors: Milton, Karen
Clemes, Stacy A.
Bull, Fiona C.
Issue Date: 2013
Publisher: © BMJ Publishing Group
Citation: MILTON, K., CLEMES, S.A. and BULL, F., 2013. Can a single question provide an accurate measure of physical activity? British Journal of Sports Medicine, 47 (1), pp. 44 - 48.
Abstract: Objective The 'single-item measure' was developed as a short self-report tool for assessing physical activity. The aim of this study was to test the criterion validity of the single-item measure against accelerometry. Design Participants (n=66, 65% female, age: 39±11 years) wore an accelerometer (ActiGraph GT3X) over a 7-day period and on day 8, completed the single-item measure. The number of days of ≥30 min of accelerometer-determined moderate to vigorous intensity physical activity (MVPA) were calculated using two approaches; first by including all minutes of MVPA and second by including only MVPA accumulated in bouts of ≥10 min (counts/min ≥1952). Associations between the single-item measure and accelerometer were examined using Spearman correlations and 95% limits of agreement. Percent agreement and κ statistic were used to assess agreement between the tools in classifying participants as sufficiently/insufficiently active. Results Correlations between the number of days of ≥30 min MVPA recorded by the single-item and accelerometer ranged from 0.46 to 0.57. Participants underreported their activity on the single-item measure (-1.59 days) when compared with all objectively measured MVPA, but stronger congruence was observed when compared with MVPA accumulated in bouts of ≥10 min (0.38 days). Overall agreement between the single-item and accelerometry in classifying participants as sufficiently/insufficiently active was 58% (k=0.23, 95% CI 0.05 to 0.41) when including all MVPA and 76% (k=0.39, 95% CI 0.14 to 0.64) when including activity undertaken in bouts of ≥10 min. Conclusions The single-item measure is a valid screening tool to determine whether respondents are sufficiently active to benefit their health.
Description: This article is closed access.
Sponsor: This research was funded by Natural England.
Version: Published
DOI: 10.1136/bjsports-2011-090899
URI: https://dspace.lboro.ac.uk/2134/16676
Publisher Link: http://dx.doi.org/10.1136/bjsports-2011-090899
ISSN: 0306-3674
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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