title: [Validity and reproducibility of a physical activity questionnaire used for health surveying among victims of the Great East Japan Earthquake].
abstract: OBJECTIVE
  This study was performed to assess the validity and reproducibility of a questionnaire on physical activity status used for health surveying among victims of the Great East Japan Earthquake.
  
  
  METHODS
  Seventy-four residents (21 men and 53 women) living in temporary housing in Kamaishi City, Iwate Prefecture, participated in this study. The physical activity status questionnaire was composed of 4 questions regarding the frequency of performing domestic and occupational physical activities, the frequency of leaving their residence, walking duration per day, and sedentary time. The physical activity level for 2 weeks was measured using a tri-accelerometer to validate the responses to the questionnaire. Test-retest reproducibility was examined at 2-week intervals.
  
  
  RESULTS
  The physical activity levels were 4,521 +/- 2,266 steps/day for men and 4,533 +/- 2,070 steps/day for women. There was a significant difference in step count between those responding differently to the 3 options in the questionnaire regarding average walking duration per day: those who reported walking for > or = 60 min, 30-60 min, or < or = 30 min had step counts of 5,343 +/- 1,757, 4,760 +/- 1,752, and 3,063 +/- 1,772 steps/day, respectively (P < 0.05). When the response options for 3 questions (excluding those for sedentary time) were given scores (a higher score for a higher physical activity level), there were significant correlations between question score and step count (r = 0.486, P < 0.05) and the amount of moderate to vigorous physical activity (r = 0.342, P < 0.05). The test-retest trial showed a moderate degree of reproducibility, with weighted K coefficients of 0.41-0.65.
  
  
  CONCLUSIONS
  Three questions on physical activity levels may allow assessment of an individual's physical activity level, with a moderate degree of reproducibility.
authors.affiliation: National Institute of Health and Nutrition.
authors.forename: Haruka
authors.initials: H
authors.lastname: Murakami
authors.forename: Eiichi
authors.initials: E
authors.lastname: Yoshimura
authors.forename: Kazuko
authors.initials: K
authors.lastname: Ishikawa-Takata
authors.forename: Yuko
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kubota
authors.forename: Nobuyo
authors.initials: N
authors.lastname: Tsuboyama-Kasaoka
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nishi
authors.forename: Yukari
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Yumi
authors.initials: Y
authors.lastname: Yaegashi
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Sakata
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Motohiko
authors.initials: M
authors.lastname: Miyachi
authors.forename: Shinkan
authors.initials: S
authors.lastname: Tokudome
mesh_terms: D055866:Earthquakes; D005260:Female; D006306:Health Surveys / Q000592:standards*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D016138:Walking