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Comparative Study
, 40, e2018060

Comparison of Self-Reported and Accelerometer-Assessed Measurements of Physical Activity According to Socio-Demographic Characteristics in Korean Adults

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Comparative Study

Comparison of Self-Reported and Accelerometer-Assessed Measurements of Physical Activity According to Socio-Demographic Characteristics in Korean Adults

Seung Won Lee et al. Epidemiol Health.

Abstract

Objectives: Previous studies have shown relatively low correlations between self-reported and accelerometer-assessed physical activity (PA). However, this association differs by socio-demographic factors, and this relationship has not been fully investigated in the general population. Thus, we investigated the correlation between self-reported and accelerometer-assessed PA and whether it differed by demographic and socioeconomic factors among the Korean general population.

Methods: This cross-sectional study included 623 participants (203 men and 420 women) aged 30 to 64 years, who completed a PA questionnaire and wore a wrist-worn accelerometer on the non-dominant wrist for 7 days. We examined the agreement for metabolic equivalent task minutes per week (MET-min/wk) between the 2 measures and calculated Spearman correlation coefficients according to demographic and socioeconomic factors.

Results: The kappa coefficient between tertiles of self-reported and accelerometer-assessed total MET-min/wk was 0.16 in the total population, suggesting overall poor agreement. The correlation coefficient between the 2 measurements was 0.26 (p<0.001) in the total population, and the correlation tended to decrease with increasing age (p for trend <0.001) and depression scores (p for trend <0.001).

Conclusions: We found a low correlation between self-reported and accelerometer-assessed PA among healthy Korean adults, and the correlation decreased with age and depression score. When studying PA using accelerometers and/or questionnaires, age and depression need to be considered, as should differences between self-reported and accelerometer-assessed PA.

Keywords: Accelerometer; Korea; Physical activity; Questionnaire.

Conflict of interest statement

The authors have no conflicts of interest to declare for this study.

Figures

Figure 1.
Figure 1.
Bland-Altman plot for metabolic equivalent task minutes per week (MET-min/wk) assessed by a questionnaire and an accelerometer. Horizontal lines are drawn at the mean difference in total MET-min/wk, and at the limits of agreement. SD, standard deviation.

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