title: Multidimensionality of the Alcohol Withdrawal Symptom Checklist: a factor analysis of the Alcohol Withdrawal Symptom Checklist and CIWA-Ar.
abstract: BACKGROUND
  This study evaluated the factor structure of 2 scales for measuring the severity of the alcohol withdrawal syndrome (AWS): a self-rated scale, the Alcohol Withdrawal Symptoms Checklist (AWSC), and an observer-rated scale, the Clinical Institute Withdrawal Assessment-Alcohol, Revised (CIWA-Ar).
  
  
  METHODS
  Alcohol-dependent male inpatients [n=127, age: 43.0+/-9.7 (mean+/-SD) years] were recruited from an inpatient treatment unit. Both measures of AWS were assessed repeatedly during the initial week of sobriety in these patients. An exploratory factor analysis was applied to the data collected on the first study day.
  
  
  RESULTS
  Five independent factors accounted for 64% of total variance in the AWSC: autonomic arousal, depression, nausea and vomiting, alcohol craving, and tension/anxiety. Three items (abdominal pain, hallucinations, confusion) could not be included in the analysis due to insufficient variance. Three dimensions identified for the CIWA-Ar (autonomic arousal, nausea and vomiting, tension/anxiety) were also captured by the ASWC. Total AWSC scores correlated well with total CIWA-Ar scores (r=0.72), supporting validity of the AWSC. Lower correlations between total CIWA-Ar and the 5 factors (r=0.32-0.52) suggested that the CIWA-Ar and AWSC factors had discriminative value.
  
  
  CONCLUSIONS
  Self-rated measures of AWS could play an important role in complementing observer-rated measures in clinical and research settings. In this sample, the AWSC appeared to identify multiple dimensions of AWS with face validity for clinical relevance.
authors: NIAAA Center for the Translational Neuroscience of Alcoholism, Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, USA. brian.pittman@yale.edu
authors: Brian
authors: B
authors: Pittman
authors: Ralitza
authors: R
authors: Gueorguieva
authors: Evgeny
authors: E
authors: Krupitsky
authors: Anatoly A
authors: AA
authors: Rudenko
authors: Barbara A
authors: BA
authors: Flannery
authors: John H
authors: JH
authors: Krystal
mesh_terms: D000328:Adult; D001007:Anxiety / Q000523:psychology; D002492:Central Nervous System Depressants / Q000009:adverse effects*; D003627:Data Interpretation, Statistical; D004311:Double-Blind Method; D000431:Ethanol / Q000009:adverse effects*; D005163:Factor Analysis, Statistical; D006801:Humans; D007297:Inpatients; D008297:Male; D008875:Middle Aged; D012372:ROC Curve; D015203:Reproducibility of Results; D013375:Substance Withdrawal Syndrome / Q000503:physiopathology* / Q000523:psychology*
chemical_list: D002492:Central Nervous System Depressants; D000431:Ethanol