title: Internal consistency and factor structure of the Portuguese version of the Liebowitz Social Anxiety Scale among alcoholic patients.
abstract: OBJECTIVE
  Liebowitz Social Anxiety Scale is an instrument used to evaluate the severity of social phobia. It has been widely used in different contexts and cultures, presenting variable psychometric properties. The objective of this article is to investigate the internal consistency and the factor structure of this scale.
  
  
  METHODS
  In a sample of 300 alcoholic patients hospitalized in 3 mental clinics in Southern Brazil, 74 of them were social phobics (24.6%). The Structured Clinical Interview for DSM-IV-Axis I Disorders - Patient Edition, a semi-structured clinical interview based on DSM-IV, was used to check for the diagnosis of social phobia. The internal consistency was measured by Cronbach's alpha. Data were subjected to a factor analysis with the principal component method of parameter estimation. Questionnaire items loading at 0.35 or above were considered in the final factor solution.
  
  
  RESULTS
  The coefficient of internal consistency was 0.95. All items showed corrected item-total correlation coefficient above 0.15, considered the minimum requested index. The factor analysis resulted in 5 dimensions which corresponded to 52.9% of the total variance. The five factors extracted were: factor I - speaking in a group, factor II - activity in public, factor III - social interaction with unknown person, factor IV - attitude of disagreement or disapproval and factor V - social interaction in leisure activity.
  
  
  CONCLUSIONS
  The scale proved to be reliable and structurally valid instrument for use in a population of alcoholic patients. The possibility of screening for social phobia through the use of the instrument may be helpful in identifying probable cases of the disorder among alcoholics.
authors.affiliation: Department of Psychiatry and Forensic Medicine, Fundação Faculdade Federal de Ciências Médicas de Porto Alegre, RS, Brazil. mabarte@portoweb.com.br
authors.forename: Mauro B
authors.initials: MB
authors.lastname: Terra
authors.forename: Helena M T
authors.initials: HM
authors.lastname: Barros
authors.forename: Airton T
authors.initials: AT
authors.lastname: Stein
authors.forename: Ivan
authors.initials: I
authors.lastname: Figueira
authors.forename: Luciana D
authors.initials: LD
authors.lastname: Athayde
authors.forename: Marcelo de S
authors.initials: Mde S
authors.lastname: Gonçalves
authors.forename: Letícia P
authors.initials: LP
authors.lastname: Tergolina
authors.forename: Joana S
authors.initials: JS
authors.lastname: Rovani
authors.forename: Dartiu Xavier
authors.initials: DX
authors.lastname: da Silveira
mesh_terms: D000328:Adult; D000437:Alcoholism / Q000523:psychology*; D001938:Brazil; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010698:Phobic Disorders / Q000175:diagnosis*; D011569:Psychiatric Status Rating Scales / Q000592:standards*; D011594:Psychometrics; D015203:Reproducibility of Results; D012647:Self-Assessment; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating