TY - JOUR
T1 - Validity of self-report methods for measuring sedentary behaviour in older adults
AU - Aguilar-Farías, Nicolás
AU - Brown, Wendy J.
AU - Olds, Timothy S.
AU - Peeters, G. M.E.E.
PY - 2015/11
Y1 - 2015/11
N2 - Objective: 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.
AB - Objective: 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.
UR - http://www.scopus.com/inward/record.url?scp=84943382405&partnerID=8YFLogxK
U2 - 10.1016/j.jsams.2014.08.004
DO - 10.1016/j.jsams.2014.08.004
M3 - Article
C2 - 25172367
AN - SCOPUS:84943382405
SN - 1440-2440
VL - 18
SP - 662
EP - 666
JO - Journal of Science and Medicine in Sport
JF - Journal of Science and Medicine in Sport
IS - 6
ER -