title: Validity and reliability of the telephone-administered international physical activity questionnaire in Brazil.
abstract: OBJECTIVE
  To evaluate the validity and reliability of the telephone-administered long IPAQ version.
  
  
  METHODS
  The questionnaire was administered by telephone to adults on days 1 and 6. On day 1, the same questionnaire was administered by face-to-face interview, and accelerometers were delivered to subjects. Reliability was measured by comparing data collected using the telephone questionnaire on days 1 and 6. Validity was measured by comparing the telephone questionnaire data with (a) face-to-face questionnaire and (b) accelerometry.
  
  
  RESULTS
  Data from all instruments were available for 156 individuals. The Spearman correlation coefficient for telephone interview reliability was 0.92 for the leisure-time section of IPAQ, and 0.87 for the transport-related section of IPAQ. The telephone interview reliability kappa was 0.78. The Spearman correlation between the telephone-administered and the face-to-face questionnaire was 0.94 for the leisure-time and 0.82 for the transport-related section. The kappa was 0.69. There was a positive association between quartiles of accelerometer data and total telephone-administered IPAQ score (P < .001). The Spearman correlation was 0.22.
  
  
  CONCLUSIONS
  The telephone-administered IPAQ presented almost perfect reliability and very high agreement with the face-to-face version. The agreement with accelerometer data were fair for the continuous score, but moderate for the categorical physical activity variables.
authors.affiliation: Post-graduate program in Epidemiology, Federal University of Pelotas, Brazil.
authors.forename: Pedro C
authors.initials: PC
authors.lastname: Hallal
authors.forename: Eduardo
authors.initials: E
authors.lastname: Simoes
authors.forename: Felipe F
authors.initials: FF
authors.lastname: Reichert
authors.forename: Mario R
authors.initials: MR
authors.lastname: Azevedo
authors.forename: Luiz R
authors.initials: LR
authors.lastname: Ramos
authors.forename: Michael
authors.initials: M
authors.lastname: Pratt
authors.forename: Ross C
authors.initials: RC
authors.lastname: Brownson
mesh_terms: D000054:Acceleration; D000328:Adult; D001938:Brazil; D005260:Female; D006801:Humans; D038622:Internationality; D007899:Leisure Activities; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D015203:Reproducibility of Results; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D013689:Telephone; D055815:Young Adult