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Factor analysis of a sleep evaluation questionnaire

Published online by Cambridge University Press:  09 July 2009

A. C. Parrott  and
I. Hindmarch
A. C. Parrott*
Affiliation:
the Department of Psychology, University of Leeds
I. Hindmarch
Affiliation:
the Department of Psychology, University of Leeds
*
1Address for correspondence: Dr A. C. Parrott, Department of Psychology, University of Leeds, Leeds LS2 9JT.
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Synopsis

A self-completion sleep evaluation questionnaire (SEQ), consisting of 10 cm line analogue rating scale questions, was constructed to investigate subjects' responses to aspects of sleep and early morning behaviour. The questions were grouped into 4 chronological areas: the ease of getting to sleep (GTS), the perceived quality of sleep (QOS), the ease of awakening from sleep (AFS), and the integrity of early morning behaviour following wakefulness (BFW). Five hundred and one SEQs were completed during several investigations into the comparative effectiveness of hypnotic drugs. The classical factor analysis produced 4 factors which corresponded to the 4 aspects of sleep and early morning behaviour listed above. The GTS and QOS factors were positively correlated (+ 0·57), as were the AFS and BFW factors (+ 0·48). The 2 sleeping state factors (GTS and QOS) were orthogonal to the 2 waking state factors (AFS and BFW).

Type
Research Article
Information
Psychological Medicine , Volume 8 , Issue 2 , May 1978 , pp. 325 - 329
Copyright
Copyright © Cambridge University Press 1978

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