title: Scoring reliability of the multiple sleep latency test in a clinical population.
abstract: OBJECTIVE
  To determine intrarater and interrater scoring reliability of the multiple sleep latency test (MSLT) in a population of sleep clinic patients.
  
  
  METHODS
  N/A.
  
  
  METHODS
  Urban sleep center.
  
  
  METHODS
  200 consecutive sleep center patients (diagnoses included: obstructive sleep apnea, narcolepsy, periodic-limb-movement, and individuals with no diagnosis).
  
  
  METHODS
  N/A.
  
  
  RESULTS
  MSLTs were recorded and scored according to standard clinical procedures. One of four clinical polysomnographers and one of seven polysomnographic technologists scored each MSLT. All MSLTs were then rescored by the same polysomnographer. The intrarater reliability coefficient for mean MSLT score was .87 and interrater reliability was .90. Coefficients for the mean number of REM onsets during the MSLT were .81 for intrarater and .88 for interrater reliability. Intrarater and interrater agreement (kappa coefficients) for the presence of at least one REM onset during the MSLT was .78 and .86, respectively. For the presence of greater than one REM onset, a kappa of .78 was obtained for intrarater agreement and .91 for interrater agreement.
  
  
  CONCLUSIONS
  The clinical MSLT displays excellent interrater and intrarater reliability estimates for both sleep latency and REM onset scores in a sleep-disordered population.
authors.affiliation: Sleep Disorders and Research Center, Henry Ford Hospital, Detroit, MI 48202, USA. cdrake1@hfhs.org
authors.forename: C L
authors.initials: CL
authors.lastname: Drake
authors.forename: M F
authors.initials: MF
authors.lastname: Rice
authors.forename: T A
authors.initials: TA
authors.lastname: Roehrs
authors.forename: L
authors.initials: L
authors.lastname: Rosenthal
authors.forename: P
authors.initials: P
authors.lastname: Guido
authors.forename: T
authors.initials: T
authors.lastname: Roth
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006970:Disorders of Excessive Somnolence / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009290:Narcolepsy / Q000175:diagnosis; D020189:Nocturnal Myoclonus Syndrome / Q000175:diagnosis; D015588:Observer Variation; D017286:Polysomnography / Q000379:methods*; D011930:Reaction Time; D015203:Reproducibility of Results; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology