title: Psychometric properties of two physical activity questionnaires, the AQuAA and the PASE, in cancer patients.
abstract: BACKGROUND
  This study aimed to evaluate the reliability and validity of two self-report physical activity (PA) questionnaires - the AQuAA (Activity Questionnaire for Adults and Adolescents) and PASE (Physical Activity Scale for the Elderly) - in cancer patients.
  
  
  METHODS
  Test-retest reliability was determined by administering the questionnaires twice within 5 days. Intraclass correlation coefficient (ICC), standard error of measurement (SEM) and smallest detectable difference (SDD) were calculated. Construct validity was determined by comparing the questionnaire results with ActiGraph accelerometer scores using Spearman correlation coefficients (rs) and ICCs. Content validity was examined using the Three-Step Test-Interview (TSTI).
  
  
  RESULTS
  Reliability for the AQuAA scores were fair to excellent (ICC = 0.57 to 0.78). Reliability for the PASE scores ranged from good to excellent (ICC = 0.67 to 0.90). Correlations between the ActiGraph and the AQuAA and the PASE were low (rs = 0.05 and 0.16 respectively, and ICC = -0.001 to 0.44). The TSTI showed that participants experienced difficulties with the examples provided with the questions, the perceptions of intensity level of PA, and with recalling the time spent on PA.
  
  
  CONCLUSIONS
  Both questionnaires showed good to excellent test-retest reliability for most scores. Construct validity of both questionnaires was low, as indicated by the low correlations with the ActiGraph. Except for a few difficulties that participants perceived when filling out the questionnaires, the content validity of both questionnaires was good.
authors.affiliation: EMGO Institute for Health and Care Research, Department of Epidemiology and Biostatistics, VU University Medical Center Amsterdam, the Netherlands. l.buffart@vumc.nl
authors.forename: Roberto D K
authors.initials: RD
authors.lastname: Liu
authors.forename: Laurien M
authors.initials: LM
authors.lastname: Buffart
authors.forename: Marie José
authors.initials: MJ
authors.lastname: Kersten
authors.forename: Marjolein
authors.initials: M
authors.lastname: Spiering
authors.forename: Johannes
authors.initials: J
authors.lastname: Brug
authors.forename: Willem
authors.initials: W
authors.lastname: van Mechelen
authors.forename: Mai J M
authors.initials: MJ
authors.lastname: Chinapaw
mesh_terms: D000328:Adult; D000368:Aged; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009369:Neoplasms / Q000523:psychology*; D010809:Physical Fitness; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires