MW8 & MotionWare User Guide: Issue 1.2.1
Page 39
Total activity score:
The total of all the activity counts
during the assumed sleep period.
Mean activity /epoch:
The total activity score divided by
the number of epochs in the assumed sleep period. Note
that this result will be expected to scale depending on the
length of the epoch.
Mean nonzero activity per epoch:
The total activity score
divided by the number of epochs with greater than zero
activity in the assumed sleep period. Note that this result
will be expected to scale depending on the length of the
epoch.
Fragmentation Index:
The sum of the
‘Mobile time (%)’
and the
‘Immobile bouts <=1min (%)’. This is an indication
of the degree of fragmentation of the sleep period, and can
be used as an indication of sleep quality (or the lack of it).
Threshold:
The threshold used for analysing movement
data. The MotionWatch was validated with a threshold of
20, but this may be chosen differently depending on the
population.
Rest per 24h (%):
The percentage of epochs in a 24 hour
period which would be counted as sleep if the whole period
were analysed as night time. The period runs for 24 hours
from midday to midday
around the “To Bed” time of the
analysis.
6.3 Saving or
Removing
Analysis
Statistics
With the analysis for the period complete, the analysis may
be saved by clicking on
the ‘Save Sleep Period’ button.
The detailed analysis window will close automatically and
the analysis period will remain highlighted in the
MotionWise window. To re-open the saved analysis,
simply click anywhere on the highlighted region in the
MotionWise window.
If the saved analysis is no longer required, click on the
‘Delete Sleep Period’ button in the sleep analysis screen to
remove it.
6.4 Adjusting
Analysis
Threshold
The threshold used for sleep analysis can be adjusted
under the
‘Options’ button. Note that the MotionWatch
system has been validated with a threshold of 20, so this
should normally be the default choice.
