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      Psychometric properties of the Modified Tonic Immobility Scale Translated title: Propiedades psicométricas de la Escala Modificada de Inmovilidad Tónica

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          Abstract

          The Tonic Immobility Scale has been only studied in abuse and/or sexual assault survivors, but tonic immobility (TI) also occurs after other types of traumatic events. Consequently, we modified the scale for this purpose and studied its factor structure, internal consistency, and convergent, divergent and discriminant validity in 392 university students, most of whom had suffered one or more traumatic events of various kinds. The Fear subscale of the Modified Tonic Immobility Scale (MTIS) showed very low internal consistency, and must be eliminated or reformulated. Discrimination indices of items 5 and 8 were very low, and tríese items must be reformulated or removed. After removing the five previous items, the shortened version of the MTIS had a one-factor structure, although model fit was not completely satisfactory. This scale showed acceptable levels of reliability, convergent validity with post-traumatic symptomatology, divergent validity with measures of depression and anxiety, and discriminant validity differentiating between groups that had and had not experienced traumatic events. The psychometric properties of the shortened version of the MTIS should be studied further. It may also be advisable to add new items of TI in order to establish whether this is a construct with more than one dimension.

          Translated abstract

          La Escala de Inmovilidad Tónica ha sido estudiada sólo en víctimas de abusos y/o agresiones sexuales, pero la inmovilidad tónica (IT) puede darse ante otros eventos traumáticos. En consecuencia, nos propusimos modificar la escala con este fin y estudiar su estructura factorial y otras propiedades psicométricas (consistencia interna y validez convergente, divergente y discriminante) en 392 universitarios, la mayoría de los cuales había padecido uno o más eventos traumáticos de distintos tipos. La subescala de miedo de la Escala Modificada de Inmovilidad Tónica (EMIT) mostró una consistencia interna muy baja y debe ser eliminada o reformulada. Los índices de discriminación de los ítems 5 y 8 fueron muy bajos y dichos ítems deben ser reformulados o eliminados. Después de eliminar los cinco ítems anteriores, la versión abreviada de la EMIT tuvo una estructura unifactorial, aunque el ajuste del modelo no fue totalmente satisfactorio. Esta escala mostró niveles aceptables de fiabilidad, validez convergente con sintomatología postraumática, validez divergente con medidas de depresión y ansiedad, y validez discriminante al diferenciar entre grupos que habían experimentado o no eventos traumáticos. Las propiedades psicométricas de la versión abreviada de la EMIT deben ser más estudiadas. Puede ser aconsejable añadir nuevos ítems de IT para determinar si este es un constructo con más de una dimensión.

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          Most cited references60

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          Discovering Statistics Using SPSS

          Andy Field (2009)
          <p>Written in his vivid and entertaining style, Andy Field provides students with everything they need to understand, use and report statistics—at every level—in the <b>Third Edition</b> of <b>Discovering Statistics Using SPSS</b>. Retaining the strong pedagogy from previous editions, he makes statistics meaningful by including playful examples from everyday student life (among other places), creating a gateway into the often intimidating world of statistics. In the process, he presents an opportunity for students to ground their knowledge of statistics through the use of SPSS.<br><br></p>
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            Comparing correlated correlation coefficients.

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              Chi-Square Tests for Goodness of Fit and Contingency Tables

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                ap
                Anales de Psicología
                Anal. Psicol.
                Universidad de Murcia (Murcia, Murcia, Spain )
                0212-9728
                1695-2294
                January 2015
                : 31
                : 1
                : 66-73
                Affiliations
                [02] Barcelona orgnameUniversidad de Barcelona Spain
                [01] Barcelona orgnameUniversidad de Barcelona orgdiv1Facultad de Psicología orgdiv2Departamento de Personalidad, Evaluación y Tratamiento Psicológicos Spain
                Article
                S0212-97282015000100008
                10.6018/analesps.31.1.158071
                a586cfde-65cb-4a09-8a21-77e00231226d

                This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 International License.

                History
                : 29 January 2013
                : 15 September 2012
                : 20 November 2012
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 8
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                SciELO Spain


                Inmovilidad tónica,trauma,escala de inmovilidad tónica,cuestionario de eventos traumáticos,Tonic immobility,tonic immobility scale,traumatic events questionnaire

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