Automatic Oxford-Medilog 9200 sleep staging scoring: Comparison with visual analysis

E. Sforza, S. Vandi

Research output: Contribution to journalArticlepeer-review


We report the results of a comparison study between automatic sleep staging using the ambulatory Oxford-Medilog 9200 system and visual analysis in a group of 30 subjects. Sleep analysis was performed during the second nighttime period of each 48-h polygraphic monitoring. The automatic analysis determined a significant underestimation of total sleep time and stage 2 non- rapid eye movement (NREM) sleep and an overestimation of stage I. No significant differences were found between the two analyses regarding slow- wave sleep and REM sleep. The differences between automatic and visual analysis of stage 2 were correlated positively with the amplitude and duration of K-complexes and negatively with the amplitude and frequency of spindles. Differences in electroencephalographic characteristics of these sleep figures were correlated negatively with age. Our results showed that (a) the Oxford-Medilog 9200 sleep staging system did not improve the scoring of stages 1 and 2 NREM sleep and (b) the degree of differences between visual and automatic analysis are related to the amplitude and frequency of sleep figures, i.e., spindles and K-complexes, used in the scoring of stage 2.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalJournal of Clinical Neurophysiology
Issue number3
Publication statusPublished - 1996


  • Automatic sleep scoring
  • Oxford-Medilog
  • Visual analysis

ASJC Scopus subject areas

  • Clinical Neurology
  • Physiology
  • Neuroscience(all)


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