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Figure 1 | BMC Medical Research Methodology

Figure 1

From: Using a single question to assess physical activity in older adults: a reliability and validity study

Figure 1

Formation of validity sample from the Project to Prevent Falls in Veterans. The dashed line indicates the point in the larger study where measures of interest for the present study begin. a Clinical assessments were not required to be part of the larger study. b Validation measures used in the present study were taken from CA2. c CA2 and telephone interviews were completed as close together in time as possible. The median number of days was 37 days for all participants (n = 159) and 33 days for the subset who also had VCA data (n = 94). Abbreviations: CA1 = first clinical assessment; interRAI = interRAI Community Health Assessment (earlier version); VCA = Veterans' Comprehensive Assessment; CA2 = second clinical assessment.

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