title: Workplace Sitting Breaks Questionnaire (SITBRQ): an assessment of concurrent validity and test-retest reliability.
abstract: BACKGROUND
  Breaks in prolonged sitting may have beneficial cardiometabolic and musculoskeletal health outcomes. Desk-based work settings are an important environment to promote and support breaks in sitting time. However, few studies have reported the psychometric properties of self-report measures to assess the frequency and duration of breaks from sitting. This study examined the concurrent validity and test-retest reliability of the Workplace Sitting Breaks Questionnaire (SITBRQ) designed to assess frequency and duration of breaks in sitting within desk-based work settings.
  
  
  METHODS
  To assess the concurrent validity, a sample of 147 desk-based employees completed the SITBRQ and wore an Actigraph GT1M accelerometer for seven consecutive days. To establish test-retest reliability, SITBRQ was administered on two separate occasions 7-14 days apart to a separate sample of 96 desk-based employees.
  
  
  RESULTS
  A low relative agreement with accelerometry (Spearman's r = 0.24 [95% CI 0.07-0.40]) was determined for self-reported frequency, but not for the duration of sitting breaks (Spearman's r = 0.05 [95% CI -0.12-0.22]). Adequate reliability was determined for both self-reported frequency (Spearman's r = 0.71 [95% CI 0.59-0.79], Cohen's kappa = 0.74 [95% CI 0.64-0.84]) and duration of sitting breaks (Spearman's r = 0.59 [95% CI 0.45-0.71], Cohen's kappa = 0.61 [95% CI 0.38-0.85]).
  
  
  CONCLUSIONS
  SITBRQ may be used for assessment of the frequency of sitting breaks within desk-based work settings with validity and reliability similar to other self-reports in the field of sedentary behaviour research. However, until adequately improved and re-evaluated, it should not be used to collect data about the duration of breaks in sitting time.
authors.affiliation: Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia. zeljko.pedisic@kif.hr.
authors.forename: Zeljko
authors.initials: Z
authors.lastname: Pedisic
authors.forename: Jason A
authors.initials: JA
authors.lastname: Bennie
authors.forename: Anna F
authors.initials: AF
authors.lastname: Timperio
authors.forename: David A
authors.initials: DA
authors.lastname: Crawford
authors.forename: David W
authors.initials: DW
authors.lastname: Dunstan
authors.forename: Adrian E
authors.initials: AE
authors.lastname: Bauman
authors.forename: Jo
authors.initials: J
authors.lastname: Salmon
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D011187:Posture; D011594:Psychometrics; D015203:Reproducibility of Results; D040242:Risk Reduction Behavior; D057185:Sedentary Behavior; D057566:Self Report / Q000592:standards*; D013997:Time Factors; D017132:Workplace; D055815:Young Adult