Figure 1.

Distribution of reported frequency of physical activity by time between first and repeat baseline questionnaires. Shaded regions indicate proportions of women reporting the various frequencies of physical activity, either at baseline, or at repeat administration of the questionnaire stratified by the time between first and repeat responses.

Armstrong et al. BMC Medical Research Methodology 2011 11:97   doi:10.1186/1471-2288-11-97
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