Validity of self-report methods for measuring sedentary behaviour in older adults

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• 作者：Nicolá ; s Aguilar-Farí ; as^a ; ^b ; ^{nicolas.aguilar@ufrontera.cl" class="auth_mail" title="E-mail the corresponding author} ; ^{nicolasaguilarfarias@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Wendy J. Brown^a ; Timothy S. Olds^c ; G.M.E.E. (Geeske) Peeters^a ; ^d
• 关键词：MARCA ; Questionnaires ; Time use ; ActivPAL
• 刊名：Journal of Science and Medicine in Sport
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：18
• 期：6
• 页码：662-666
• 全文大小：497 K

文摘

Sedentary behaviour (SB) is associated with a range of negative health outcomes, but little is known about the validity of self-report methods for measuring SB in older adults. Thus, the aim was to assess the reliability and validity of two instruments for measuring SB in older adults.

Design

Cross-sectional study.

Methods

41 community-dwelling older adults (14/27 male/female, 74.5 ± 7.6 years) wore an ActivPAL³™ (AP) for 7 consecutive days, then completed (1) a single question (SQ) to assess sitting time on a usual weekday, weekend day and yesterday (i.e. the last day of monitoring), and (2) a computer-delivered 24-h recall (MARCA) for the last two days. Intraclass correlation (ICC) and standard error of measurement (SEM) were used to assess test–retest reliability; validity was examined using Spearman's correlation, mean bias and limits of agreement, and kappa for classifying tertiles of time in SB, with AP as the reference standard.

Results

For the SQ, the ICC ranged from 0.64 to 0.79, with SEM 1.03–1.42 h/day. ICC for the MARCA ranged from 0.72 to 0.96, with SEM 0.47–1.18 h/day. The SQ showed modest correlation with AP (r = 0.13–0.33), with mean biases of about −3.5 h/day. The MARCA showed moderate correlation with AP (r = 0.49–0.67), with mean biases of about 1.4 h/day. When categorised into tertiles, agreement was significant but fair for the SQ, and moderate for the MARCA.

Conclusion

Both measures have acceptable reliability, but the MARCA provides more valid estimates of SB than the SQ, which underestimates SB in this group of older adults.