title: Validity of a Self-Report Recall Tool for Estimating Sedentary Behavior in Adults.
abstract: BACKGROUND
  Sedentary behavior is continuing to emerge as an important target for health promotion. The purpose of this study was to determine the validity of a self-report use of time recall tool, the Multimedia Activity Recall for Children and Adults (MARCA) in estimating time spent sitting/lying, compared with a device-based measure.
  
  
  METHODS
  Fifty-eight participants (48% female, [mean ± standard deviation] 28 ± 7.4 years of age, 23.9 ± 3.05 kg/m(2)) wore an activPAL device for 24-h and the following day completed the MARCA. Pearson correlation coefficients (r) were used to analyze convergent validity of the adult MARCA compared with activPAL estimates of total sitting/lying time. Agreement was examined using Bland-Altman plots.
  
  
  RESULTS
  According to activPAL estimates, participants spent 10.4 hr/day [standard deviation (SD) = 2.06] sitting or lying down while awake. The correlation between MARCA and activPAL estimates of total sit/lie time was r = .77 (95% confidence interval = 0.64-0.86; P < .001). Bland-Altman analyses revealed a mean bias of +0.59 hr/day with moderately wide limits of agreement (-2.35 hr to +3.53 hr/day).
  
  
  CONCLUSIONS
  This study found a moderate to strong agreement between the adult MARCA and the activPAL, suggesting that the MARCA is an appropriate tool for the measurement of time spent sitting or lying down in an adult population.
authors.affiliation: Centre for Research on Exercise, Physical Activity, and Health CRExPAH, School of Human Movement Studies, The University of Queensland, Brisbane, QLD, Australia.
authors.forename: Sjaan R
authors.initials: SR
authors.lastname: Gomersall
authors.forename: Toby G
authors.initials: TG
authors.lastname: Pavey
authors.forename: Bronwyn K
authors.initials: BK
authors.lastname: Clark
authors.forename: Adib
authors.initials: A
authors.lastname: Jasman
authors.forename: Wendy J
authors.initials: WJ
authors.lastname: Brown
mesh_terms: D000328:Adult; D005260:Female; D006293:Health Promotion; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D009043:Motor Activity; D057185:Sedentary Behavior; D057566:Self Report; D012985:Software Design; D011795:Surveys and Questionnaires; D055815:Young Adult