Reliability and validity of a modified self-administered version of the Active Australia physical activity survey in a sample of mid-age women
Article first published online: 9 DEC 2008
© The Authors. Journal Compilation © 2008 Public Health Association of Australia
Australian and New Zealand Journal of Public Health
Volume 32, Issue 6, pages 535–541, December 2008
How to Cite
Brown, W. J., Burton, N. W., Marshall, A. L. and Miller, Y. D. (2008), Reliability and validity of a modified self-administered version of the Active Australia physical activity survey in a sample of mid-age women. Australian and New Zealand Journal of Public Health, 32: 535–541. doi: 10.1111/j.1753-6405.2008.00305.x
- Issue published online: 9 DEC 2008
- Article first published online: 9 DEC 2008
- Submitted: February 2008 Revision requested: July 2008 Accepted: September 2008
- physical activity;
- validation study;
Objective: To assess the test-retest reliability and validity of a modified self-administered version of the Active Australia physical activity survey.
Methods: One hundred and fifty-nine mid-age women (54–59 years) completed a mailed physical activity questionnaire before recording daily pedometer step counts for seven consecutive days. A random subsample (n=44) also wore an accelerometer during this period. Participants then completed the physical activity questionnaire again. Spearman's ρ and per cent agreement were used to assess test-retest reliability. Self-reported physical activity data (time 2) were compared with pedometer and accelerometer data using box plots and Spearman's correlations to assess validity.
Results: Median time between surveys was 13 days. Median frequency and duration of moderate and vigorous physical activity were the same at both surveys, but median walking frequency was slightly higher at time 2 than time 1. Reliability coefficients for frequency/time in each domain of physical activity ranged from 0.56–0.64 and per cent agreement scores ranged from 40% to 65% for the physical activity categories; agreement was 76% for ‘meeting guidelines’. Correlations (p) between self-reported physical activity and 1) weekly pedometer steps and 2) accelerometer data for duration of at least moderate intensity physical activity were 0.43 and 0.52 respectively.
Conclusions:The measurement properties of this modified self-administered physical activity survey are similar to those reported for the original computer assisted telephone interview survey.
Implications: This modified version of the Active Australia survey is suitable for use in self-administered format.