title: Validity of a physical activity questionnaire in Shanghai.
abstract: OBJECTIVE
  In large epidemiologic studies, physical activity (PA) is often assessed using PA questionnaires (PAQ). Because available PAQ may not capture the full range of PA in which urban Chinese adults engage, a PAQ was developed for this purpose. We examined the validity of this PAQ and the 1-yr stability of PA in 545 urban Shanghai adults.
  
  
  METHODS
  The PAQ was interview-administered twice, approximately 1 yr apart, and participants also wore an accelerometer and completed a PA-log for seven consecutive days every 3 months during the same year. The intraclass correlation coefficient (ICC) was used to evaluate the stability of PA across questionnaire administrations, and Spearman correlation coefficients (ρ) and mean differences and 95% limits of agreement were used to examine the validity of the questionnaire compared against accelerometry and the PA-log.
  
  
  RESULTS
  When measured by accelerometry, estimates of time spent in moderate-to-vigorous PA were lower and estimates of time spent sedentary were higher than when self-reported on the PAQ (P < 0.001). Total PA (ICC = 0.65) and PA domains (ICC = 0.45-0.85) showed moderate to high stability across PAQ administrations. Total PA (ρ = 0.30), moderate-to-vigorous activity (ρ = 0.17), light activity (ρ = 0.36), and sedentary behavior (ρ = 0.16) assessed by PAQ and by accelerometry were significantly and positively correlated, and correlations of the PAQ with the PA-log (ρ = 0.36-0.85) were stronger than those observed with accelerometry.
  
  
  CONCLUSIONS
  The PAQ significantly overestimated time spent in moderate-to-vigorous activity and underestimated time spent in light activity and sedentary behavior compared with accelerometry, but it performed well at ranking participants according to PA level.
authors.affiliation: National Cancer Institute, Division of Cancer Epidemiology and Genetics, Bethesda, MD, USA.
authors.forename: Tricia M
authors.initials: TM
authors.lastname: Peters
authors.forename: Xiao-Ou
authors.initials: XO
authors.lastname: Shu
authors.forename: Steven C
authors.initials: SC
authors.lastname: Moore
authors.forename: Yong Bing
authors.initials: YB
authors.lastname: Xiang
authors.forename: Gong
authors.initials: G
authors.lastname: Yang
authors.forename: Ulf
authors.initials: U
authors.lastname: Ekelund
authors.forename: Da-Ke
authors.initials: DK
authors.lastname: Liu
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Tan
authors.forename: Bu-Tian
authors.initials: BT
authors.lastname: Ji
authors.forename: Arthur S
authors.initials: AS
authors.lastname: Schatzkin
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.forename: Wong Ho
authors.initials: WH
authors.lastname: Chow
authors.forename: Charles E
authors.initials: CE
authors.lastname: Matthews
authors.forename: Michael F
authors.initials: MF
authors.lastname: Leitzmann
mesh_terms: D056044:Actigraphy; D000328:Adult; D000368:Aged; D002681:China; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires / Q000592:standards*
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