title: Test-Retest Reliability of the DePaul Symptom Questionnaire.
abstract: BACKGROUND
  The DePaul Symptom Questionnaire (DSQ) was developed to provide a structured approach for collecting standardized symptomatology and health history information to allow researchers and clinicians to determine whether a patient meets the diagnostic criteria for myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), myalgic encephalomyelitis (ME), and/or chronic fatigue syndrome (CFS).
  
  
  OBJECTIVE
  The purpose of this study was to examine the test-retest reliability of the DSQ.
  
  
  METHODS
  Test-retest reliability of the measure was examined with a sample of 26 adults self-identifying as having either ME/CFS, ME and/or CFS and 25 adults who did not self-identify as having these illnesses and were otherwise healthy controls.
  
  
  RESULTS
  Overall, the majority of items on the DSQ exhibited good to excellent test-retest reliability, with Pearson's or kappa correlation coefficients that were 0.70 or higher.
  
  
  CONCLUSIONS
  Thus, the present study suggests that the DSQ is a reliable diagnostic measure that can provide a standardized way of examining illness constructs and symptomatology among patients who identify as having ME/CFS, ME and/or CFS.
authors.affiliation: DePaul University.
authors.forename: Leonard A
authors.initials: LA
authors.lastname: Jason
authors.affiliation: Loyola University Chicago.
authors.forename: Suzanna
authors.initials: S
authors.lastname: So
authors.affiliation: DePaul University.
authors.forename: Abigail A
authors.initials: AA
authors.lastname: Brown
authors.affiliation: DePaul University.
authors.forename: Madison
authors.initials: M
authors.lastname: Sunnquist
authors.affiliation: DePaul University.
authors.forename: Meredyth
authors.initials: M
authors.lastname: Evans
keywords: DePaul Symptom Questionnaire; Myalgic Encephalomyelitis; Myalgic Encephalomyelitis/chronic fatigue syndrome; chronic fatigue syndrome; reliability