EVALUATION OF THE PHONE VERSION OF THE SEVEN DAY PHYSICAL ACTIVITY RECALL

73 This study evaluated the reliability and validity of the phone version of the 7-Day Physical Activity Recall (7-D PAR), a standardized interview. The in-person version of the 7-D PAR has been one of the most extensively studied self-report measures of physical activity and is shown to be valid and reliable. Efficiency in research would be improved if the 7-D PAR could be conducted via phone, but this version needs to be validated. Seventy-four adults (48 females, 26 males), ranging widely in age (18 to 67) and activity levels, were studied. Participants completed 7 days of activity monitoring using the Tritrac-R3D® (TT), an accelerometer which records movement in 3-dimensions. Participants completed activity questionnaires, and both versions of the 7-D PAR on separate days, in counter-balanced order. Reliability was assessed by comparing the phone and in-person 7-D PAR data for six matched days. Validity was examined by comparing 7-D PAR and TT data for 6 matched days. Intraclass correlations between the phone and in-person 7-D PAR total KKD (kcals*kg-1*day-1) were high (R=.957). Correlations of TT-assessed KKD were r=.413, p<.001 with the phone 7-D PAR and r=.445, p<.001 with the in-person 7-D PAR. Analyses of recall of minutes of physical activity at different intensity levels on the phone 7-D PAR and recorded by the TT indicate low correlations at “moderate” levels of activity (r=.153, p<.20), and higher correlations for“hard” (r=.508, p<.001) and “very hard”(r=.764, p<.001) activity. Correlations were similar for the in-person 7-D PAR (r=.112, p<.35; r=.665, p<.001; r=.663, p<.001 - “moderate”, “hard” and“very hard”, respectively). The phone and in-person 7-D PARs are highly reliable measures of physical activity. The validity of both the phone and in-person 7-D PARs, especially for reports of activity at higher intensity levels, is supported by the correlations with objective monitoring.