Assessing SB as a sum of behaviours and using a previous day recall were the most promising features of existing tools .
Accuracy was poor for all existing tools , with underestimation and overestimation of SB .
There was a lack of evidence about sensitivity to change .
OBJECTIVE Sedentary behaviour ( SB ) has distinct deleterious health outcomes , yet there is no consensus on best practice for measurement .
This study aim ed to identify the optimal self-report tool for population surveillance of SB , using a systematic framework .
Adults' past-day recall of sedentary time: reliability, validity, and responsiveness.
PURPOSE Past-day recall rather than recall of past week or a usual/typical day may improve the validity of self-reported sedentary time measures . This study examined the test-retest reliability , criterion validity , and responsiveness of the seven-item question naire , Past-day Adults ' Sedentary Time ( PAST ) . METHODS Participants ( breast cancer survivors , n = 90 , age = 33 - 75 yr , body mass index = 25 - 40 kg·m ) in a 6-month r and omized controlled trial of a lifestyle-based weight loss intervention completed the interviewer-administered PAST question naire about time spent sitting/lying on the previous day for work , transport , television viewing , nonwork computer use , reading , hobbies , and other purpose s ( summed for total sedentary time ) . The instrument was administered at baseline , 7 d later for test-retest reliability ( n = 86 ) , and at follow-up . ActivPAL3-assessed sit/lie time in bouts of ≥5 min during waking hours on the recall day was used as the validity criterion measure at both baseline ( n = 72 ) and follow-up ( n = 68 ) . Analyses included intraclass correlation coefficients , Pearson 's correlations ( r ) , and Bl and -Altman plots and responsiveness index . RESULTS The PAST had fair to good test-retest reliability ( intraclass correlation coefficient = 0.50 , 95 % confidence interval [ CI ] = 0.32 - 0.64 ) . At baseline , the correlation between PAST and activPAL sit/lie time was r = 0.57 ( 95 % CI = 0.39 - 0.71 ) . The mean difference between PAST at baseline and retest was -25 min ( 5.2 % ) , 95 % limits of agreement = -5.9 to 5.0 h , and the activPAL sit/lie time was -9 min ( 1.8 % ) , 95 % limits of agreement = -4.9 to 4.6 h. The PAST showed small but significant responsiveness ( -0.44 , 95 % CI = -0.92 to -0.04 ) ; responsiveness of activPAL sit/lie time was not significant . CONCLUSION The PAST question naire provided an easy-to-administer measure of sedentary time in this sample . Validity and reliability findings compare favorably with other sedentary time question naires . Past-day recall of sedentary time shows promise for use in future health behavior , epidemiological , and population surveillance studies
Assessing SB as a sum of behaviours and using a previous day recall were the most promising features of existing tools .
Accuracy was poor for all existing tools , with underestimation and overestimation of SB .
There was a lack of evidence about sensitivity to change .
OBJECTIVE Sedentary behaviour ( SB ) has distinct deleterious health outcomes , yet there is no consensus on best practice for measurement .
This study aim ed to identify the optimal self-report tool for population surveillance of SB , using a systematic framework .