Propriedades psicométricas da OAS - Observer Alexithymia Scale: versão brasileira / Observer Alexithymia Scale (OAS), psychometric properties: Brazilian version

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of this study was to analyze psychometric properties of the Brazilian version of the Observer Alexithymia Scale (OAS) by estimating its internal consistency, test-retest reliability and inter-rater reliability; construct validity through factorial analysis, criteria validity and convergent validity in a clinical population with substance dependence or abuse. The OAS is a brief observer report designed to be used by clinicians as well as patients relatives and acquaintances, to identify Alexithymia according to 5 dimensions: distant, uninsightful, somatizing, humorless, and rigid. It is composed of 33 items rated on a 4-point Likert scale, ranging from 0 (never, not at all like the person) to 3 (all of the time, completely like the person). Data were gathered at an outpatient public service for substance dependence and a non-profit religious inpatient institution also for substance dependence. The sample was comprised of three groups: G1 - 200 relatives or acquaintances of substance dependence and abusers (alcohol=46.5%; drugs=53.5 %), aged from 18 to 82 (M = 48, SD = 12), both sexes (F=88%; M=12%); G2 39 outpatients at the public service for substance dependence or abuse (alcohol=66,6%; drugs=33,3%), both sexes (F=15.3%; M=84.6%); G3 9 clinicians at the public service (clinical experience ranging from 1-15 years). Reliability studies suggested good internal consistency and temporal stability of the scale for both G1 (alpha = .83; rs = .79) and G3 (alpha= .85; rs= .80), but low inter-rater reliability when scored by relatives and clinicians (rs = .14). The OASs exploratory factor analysis suggested a structure of 5 dimensions (48% total variance) as the original one, and 30 items with a minimum factor loadings of .40. When the degree of alexithymia was estimated as a criteria, the study indicated that relatives do not view those with substance dependence differently (p = 0.16) according to type of dependence (alcohol or drugs). For the convergent study, G2 participants completed the Toronto Alexithymia Scale (TAS) and the scores were compared against OAS-30, according to G1 and G3. Results suggested a negligible association (rs = .29; p >0.05) between TAS-22 and OAS, according to G1 and a lack of association (rs = -.18; p >0.20) between TAS-22 and OAS-30 scored by G3, suggesting that both scales would be measuring different constructs. The Portuguese version of the OAS-30 demonstrated good internal consistency and temporal stability. Its structure seems to be compatible to the original one, but a few items need revision, especially on factor 4. Some considerations will be made regarding the educational level of respondents, as well as the degree of acquaintance with the person who is substance dependent.

ASSUNTO(S)

regulação das emoções psychosomatic medicine affect disorders emotion regulation transtornos afetivos alexitimia personality assessment psicologia avaliação da personalidade alexithymia medicina psicossomática

ACESSO AO ARTIGO

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