title: The Rivermead Post Concussion Symptoms Questionnaire: a confirmatory factor analysis.
abstract: OBJECTIVE
  To investigate the factor structure of the Rivermead Post Concussion Symptoms Questionnaire (RPQ) among individuals seen as part of routine follow-up following traumatic brain injury.
  
  
  METHODS
  RPQ data from 168 participants was examined (mean age 35.2, SD 14.3; 89% with post traumatic amnesia duration<24 hours) six months after admission to an Accident & Emergency Department following TBI. Structural equation modelling was carried out to evaluate proposed models of the underlying structure of post-concussion symptoms (PCS).
  
  
  RESULTS
  The results support the existence of separate cognitive, emotional and somatic factors, although there was a high degree of covariation between the three factors. A two-factor model that collapsed the emotional and somatic factors together showed a similar goodness-of-fit to the data, whilst a one-factor model proved a poor fit.
  
  
  CONCLUSIONS
  The results support the notion of post-concussion symptoms as a collection of associated but at least partially separable cognitive, emotional and somatic symptoms, although questions persist regarding symptom specificity. The use of the RPQ is discussed, and classification bands for use in clinical practice are suggested.
authors.affiliation: Lishman Brain Injury Unit, The Maudsley Hospital, Denmark Hill, London, SE5 8AZ, UK. s.potter@iop.kcl.ac.uk
authors.forename: Seb
authors.initials: S
authors.lastname: Potter
authors.forename: Eleanor
authors.initials: E
authors.lastname: Leigh
authors.forename: Derick
authors.initials: D
authors.lastname: Wade
authors.forename: Simon
authors.initials: S
authors.lastname: Fleminger
mesh_terms: D000293:Adolescent; D000328:Adult; D003071:Cognition / Q000502:physiology; D004644:Emotions / Q000502:physiology; D005163:Factor Analysis, Statistical; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D038223:Post-Concussion Syndrome / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires