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Statistical comparison of transition sleep variables in depressed and normal subjects

Published online by Cambridge University Press:  16 April 2020

G Iorio ,
F Marciano ,
M Martino  and
D Kemali
G Iorio
Affiliation:
Department of Psychiatry, First Medical School, University of Naples
F Marciano*
Affiliation:
Istituto di Cibernetica del CNR, Via Toiano 6, 80072 Arco Felice, Naples, Italy
M Martino
Affiliation:
Department of Psychiatry, First Medical School, University of Naples
D Kemali
Affiliation:
Department of Psychiatry, First Medical School, University of Naples
*
*Correspondence and reprints.
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Summary

We present the values for the amount of transitions, for the total stage duration and for the first time of occurrence (latency) of a stage. A test aimed at evaluating probability values for the transition from one sleep stage to another was applied to the hypnograms of ten patients with endogenous depression and of ten normal controls. Sleep data (EEG, EMG, EOG) of each subject were recorded on magnetic tape and paper for three consecutive nights. Following sleep stage classification, portions of hypnograms of 480 min, further divided into sub-periods, were retained for the purpose of the test. The results proved that significant differences between depressed and control subjects exist among the data corresponding to various sleep stages. These findings also provided useful statistical indications in order to reduce the amount of computing needed by an automatic classifier.

Keywords

sleephypnogramdepressionstatistical comparison
Type
Original article
Information
European Psychiatry , Volume 9 , Issue 2 , 1994 , pp. 95 - 100
Copyright
Copyright © European Psychiatric Association 1994

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