Can a single question provide an accurate measure of physical activity?

Milton, Karen, Clemes, Stacy and Bull, Fiona (2013) Can a single question provide an accurate measure of physical activity? British Journal of Sports Medicine, 47. pp. 44-48. ISSN 0306-3674

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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.

Item Type: Article
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Depositing User: Pure Connector
Date Deposited: 26 Jan 2018 15:30
Last Modified: 21 Mar 2019 11:43
URI: https://ueaeprints.uea.ac.uk/id/eprint/66101
DOI: 10.1136/bjsports-2011-090899

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