title: Validity and reliability of the Geriatric Anxiety Inventory in Parkinson's disease.
abstract: OBJECTIVE
  To examine the psychometric properties of a novel anxiety rating scale, the Geriatric Anxiety Inventory (GAI) in Parkinson's disease (PD).
  
  
  METHODS
  The predictive validity of the GAI was tested against the presence of any DSM-IV anxiety disorders in 58 PD patients using receiver operating curve analysis. The concurrent validity of this scale was also studied against the state half of the Spielberger State Trait Anxiety Inventory (STAI). The internal consistency and test-retest reliability of the GAI were also examined.
  
  
  RESULTS
  The GAI displayed good concurrent validity against the STAI and the DSM-IV. It also showed good internal consistency and test-retest reliability.
  
  
  CONCLUSIONS
  This study suggested that the GAI is an appropriate scale to use in non-demented PD patients.
authors.affiliation: School of Medicine, University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, Australia. sally_matheson@bigpond.com
authors.forename: Sally F
authors.initials: SF
authors.lastname: Matheson
authors.forename: Gerard J
authors.initials: GJ
authors.lastname: Byrne
authors.forename: Nadeeka N W
authors.initials: NN
authors.lastname: Dissanayaka
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Pachana
authors.forename: George D
authors.initials: GD
authors.lastname: Mellick
authors.forename: John D
authors.initials: JD
authors.lastname: O'Sullivan
authors.forename: Peter A
authors.initials: PA
authors.lastname: Silburn
authors.forename: Anna
authors.initials: A
authors.lastname: Sellbach
authors.forename: Rodney
authors.initials: R
authors.lastname: Marsh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001007:Anxiety / Q000175:diagnosis*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000523:psychology*; D011594:Psychometrics; D012372:ROC Curve; D015203:Reproducibility of Results