Conclusion: The modifications to the SBQ did not improve the correlation between self-assessment of SB and objective determination. Individual differences in daily SB estimation between both methods (in relation to accelerometry) were +3.82 h ± 4.36 h for women and +0.48 h ± 2.58 h for men ( p < 0.001). No correlation was found between the questionnaire and accelerometer data for both subgroups (rho ≤ 0.281, p ≥ 0.174). Women estimated their sedentary time to be almost 50% higher than men (median 74.5 h vs.

Results: Using the modified SBQ (mSBQ), a significant gender difference in weekly sedentary time was found. The Bland–Altman method was used to test the agreement between self-reported and accelerometer-measured SB time. Criterion validity was assessed using Spearman’s Rho coefficients. Based on prior investigations of the SBQ, analyses were conducted in a gender-specific manner. Methods: Cross-sectional data from an adult sample ( n = 64, 20–85 y, 25 m, 39 f) were used in this first validation study. Contemporary explanations covering the use of smart devices have been added to the original instrument, and sitting while handwriting was explicated in more detail. The aim of this study was to validate a modified version of the widely used Sedentary Behavior Questionnaire (SBQ) compared to waist-worn accelerometers as an objective measurement. In addition to a variety of sophisticated technical methods, questionnaires are still an attractive method for quick, easy, comprehensive, and cost-effective estimation of SB.

Background: Physical inactivity and excessive sedentary behavior (SB) are growing public health issues that require surveillance, guidelines, and targeted interventions.

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