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How many nights are enough? The short-term stability of sleep parameters in elderly insomniacs and normal sleepers
Temporal stability is an important fundamental quality when measuring sleep parameters, yet it has been infrequently assessed. Generalizability theory was used to estimate the short-term temporal stability of five variables commonly used to characterize insomnia: sleep onset latency, total sleep tim...
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Published in: | Psychophysiology 1999-03, Vol.36 (2), p.233-244 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Temporal stability is an important fundamental
quality when measuring sleep parameters, yet it has been
infrequently assessed. Generalizability theory was used
to estimate the short-term temporal stability of five variables
commonly used to characterize insomnia: sleep onset latency,
total sleep time, wake after sleep onset, time in bed,
and sleep efficiency. Estimates were calculated for 32
elderly primary insomniacs and 32 elderly normal sleepers,
both in the lab and at home, using both sleep logs and
polysomnography (PSG). A week of recording using either
PSG or sleep logs was typically sufficient to achieve adequate
stability (defined as G coefficient of at least
0.80) with some notable exceptions: (a) when using log-derived
measures with insomniacs, a 3-week average was necessary
for wake after sleep onset and (b) more than a 2-week average
was necessary for sleep onset latency. Because of the substantial
commitment involved in the physiological recording of sleep,
alternative forms of aggregation are considered with the
intent of improving temporal stability. |
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ISSN: | 0048-5772 1540-5958 1469-8986 |
DOI: | 10.1111/1469-8986.3620233 |