Validity and reliability of the telephone-administered international physical activity questionnaire in Brazil.
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.
Hallal
Pedro C
PC
Post-graduate program in Epidemiology, Federal University of Pelotas, Brazil.
Simoes
Eduardo
E
Reichert
Felipe F
FF
Azevedo
Mario R
MR
Ramos
Luiz R
LR
Pratt
Michael
M
Brownson
Ross C
RC
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