title: Validity and reliability of International Physical Activity Questionnaire-Short Form in Chinese youth.
abstract: OBJECTIVE
  The psychometric profiles of the widely used International Physical Activity Questionnaire-Short Form (IPAQ-SF) in Chinese youth have not been reported. The purpose of this study was to examine the validity and reliability of the IPAQ-SF using a sample of Chinese youth.
  
  
  METHODS
  One thousand and twenty-one youth (M(age) = 14.26 +/- 1.63 years, 52.8% boys) from 11 cities in China wore accelerometers for 7 consecutive days and completed the IPAQ-SF on the 8th day to recall their physical activity (PA) during accelerometer-wearing days. A subsample of 92 youth (M(age) = 15.90 +/- 1.35 years, 46.7% boys) completed the IPAQ-SF again a week later to recall their PA during accelerometer-wearing days. Differences in PA estimated by the IPAQ-SF and accelerometer were examined by paired-sample t test. Spearman correlation coefficients were used to examine the correlation between the IPAQ-SF and accelerometer. Test-retest reliability of the IPAQ-SF was determined by the intraclass correlation coefficient (ICC).
  
  
  RESULTS
  Compared with accelerometer, the IPAQ-SF overestimated sedentary time, moderate PA (MPA), vigorous PA (VPA), and moderate-to-vigorous PA (MVPA). Correlations between PA (total PA, MPA, VPA, and MVPA) and sedentary time measured by 2 instruments ranged from "none" to "low" (p = .08-.31). Test-retest ICC of the IPAQ-SF ranged from "moderate" to "high" (ICC = .43-.83), except for sitting in boys (ICC = .06), sitting for the whole sample (ICC = .32), and VPA in girls (ICC = .35).
  
  
  CONCLUSIONS
  The IPAQ-SF was not a valid instrument for measuring PA and sedentary behavior in Chinese youth.
authors: Shanghai University of Sport, 399 Chang Hai Road, Shanghai 200438, PR China.
authors: Chao
authors: C
authors: Wang
authors: Shanghai University of Sport, 399 Chang Hai Road, Shanghai 200438, PR China.
authors: Peijie
authors: P
authors: Chen
authors: Shanghai University of Sport, 399 Chang Hai Road, Shanghai 200438, PR China.
authors: Jie
authors: J
authors: Zhuang
mesh_terms: D061725:Accelerometry / Q000295:instrumentation*; D000293:Adolescent; D002648:Child; D002681:China; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D009043:Motor Activity; D011594:Psychometrics; D015203:Reproducibility of Results; D012737:Sex Factors; D011795:Surveys and Questionnaires