Purpose: To evaluate the reliability and agreement of the time sitting items from the IPAQ and GPAQ.
Methods: An evaluation of diagnostic technologies was done. The IPAQ and GPAQ were administered by two interviewers to a sample of 92 adults (42.4 ± 13.9 years), twice with an interval of time between 3 to 6 days, in the same order of application established randomly in the first test. In the analysis, we assessed the test-retest reliability of the sitting items from the IPAQ and GPAQ and between items reliability by Intraclass Correlation Coefficient (CCI 2.1) and their confidence intervals at 95% (95% CI). The level of agreement was established by the Bland-Altman method.
Results: Test-retest reliability to time sitting items of the IPAQ was good (ICC: 0.77 (95% CI: 0.67-0.84) and very good to GPAQ (ICC: 0.83 95% CI 0.76-0.89). The agreement was poor with a mean difference of -0.04 (limits of agreement: -4.95, 4.9 h/d) using the IPAQ and 0.15 h/d (limits of agreement -4.2, 4.5 h/d) using the GPAQ. Between items, reliability was very good in the first test (CCI: 0.81 95% CI 0.73-0.87) and in the second test (CCI:0.82 95% CI 0.74-0.88); the level of agreement was poor in the first test with a mean difference of -0.54 (limits of agreement: -4.7; 3.6 h/d) and in the second test -0.36 (limits of agreement: -4.9; 4.2 h/d).
Conclusions: The measurement of sedentary behavior or physical hypoactivity through the items of the IPAQ and GPAQ showed good reliability but poor agreement, it is suggested to improve the measurement of this behavior. Additionally, the results showed that the sitting item of the IPAQ and GPAQ provide similar information.
Key-words: Questionnaire, reliability, sedentarism, IPAQ, GPAQ