Format

Send to

Choose Destination
Clin Rehabil. 2008 Oct-Nov;22(10-11):871-7. doi: 10.1177/0269215508092822.

Test--retest reliability of the StepWatch Activity Monitor outputs in individuals with chronic stroke.

Author information

1
Department of Surgery, University of Auckland, Auckland, New Zealand. s.mudge@auckland.ac.nz

Abstract

OBJECTIVE:

To examine the test-retest reliability of the StepWatch Activity Monitor outputs over two periods, a week apart, in participants with stroke.

DESIGN:

Test-retest reliability study over monitoring periods of one, two and three days.

SETTING:

Participant's usual environment.

PARTICIPANTS:

Forty participants more than six months post stroke.

MAIN MEASURES:

StepWatch outputs: total step count, number of steps at high medium and low stepping rates, sustained activity indices, peak activity index.

RESULTS:

The intraclass correlation coefficients were high for all StepWatch outputs and all monitoring periods but were highest for the three-day monitoring period (0.930-0.989) and lowest for the one-day monitoring period (0.830-0.950). The coefficient of variation ranged from 6.7% to 48.7% over the monitoring periods, with higher variation shown for shorter monitoring periods. The most reliable four outputs had 95% limits of agreement between three-day periods that were less than 40%. These were total step count (+/-37.8%), highest step rate in 1 minute (+/-23.0%), highest step rate in 5 minutes (+/-38.6%) and peak activity index (+/-29.8%). The highest step rate in 1 minute was the only StepWatch output that had 95% limits of agreement less than 40% for the two-day (+/-31.2%) and one-day (+/-36.7%) monitoring periods.

CONCLUSIONS:

Total step count, highest step rate in 1 minute, highest step rate in 5 minutes and peak activity index have good test-retest reliability over a three-day monitoring period, with lower reliability shown by the other StepWatch outputs. In general, monitoring over one or two days is less reliable.

PMID:
18955419
DOI:
10.1177/0269215508092822
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center