Validação brasileira da escala de controle percebido no presente sobre a voz com base na teoria de resposta ao item

Abstract

The present dissertation investigated the relationship between voice and self-regulation, through theoretical and empirical perspectives, as well as the validation of an instrument aimed at the self-assessment of vocal control perceived in the present on the voice. This dissertation is divided into two articles: 1) an integrative review that aimed to verify the relationship between self-regulation and vocal behavior presented in the literature and 2) an empirical study that aims to develop the stages of evidence of validity of the self-assessment instrument of the vocal control perceived in the present on the voice, the ECPP-V, with the purpose of estimating the psychometric properties of its items based on the Item Response Theory (IRT). The review article collected data from national and international literature in the PubMed, LILACS and SciELO databases, in which 10,176 articles were identified; of these, 10 were selected after applying the eligibility criteria. The articles found highlighted self-regulation as an important factor in vocal behavior, and the studies were mostly published in North American magazines with a high impact factor, pointed out the relevance of developing self-control strategies to assist in aspects of vocal rehabilitation and highlighted the need to build new, more effective instruments for future studies on the subject. . The empirical study used data from 168 individuals, where 127 had vocal changes and 41 were vocal healthy. For the steps of evidence of validity, the following analyzes were performed: Cronbach's Alpha, Exploratory Factor Analysis (AFE), Confirmatory Factor Analysis (AFC) and Item Response Theory (IRT). The instrument found good internal consistency, with a two-factor structure from the AFE, in addition to showing satisfactory values in the model's adjustment indices, thus confirming the structure from the AFC. IRT was applied from Samejima's 2PL model to assess the discrimination (a) and difficulty (b) parameters of the instrument items, item 5 “I can control my daily reactions related to my voice problem” was presented as most discriminative item and item 8 “I do not control my reaction to my voice problem” as the most difficult item. The results obtained allow confirming self-regulation as an important factor in vocal behavior and suggests a validated version for Brazilian Portuguese of ECPP-V from the IRT, which involves a structure with 8 items and 2 factors, with a calculation performed using the latent trait of individuals.