A peer-reviewed, evidence-based journal for clinicians in the field of neuroscience
Issue link: https://innovationscns.epubxp.com/i/555782
Innovations in CLINICAL NEUROSCIENCE [ V O L U M E 1 2 , N U M B E R 7 – 8 , J U L Y – A U G U S T 2 0 1 5 ] 22 range from 0 to 63. It has high internal consistency and concurrent validity vis-à-vis other measures of depression. 21 Each item is rated on a four-point scale ranging from 0 to 3. Its psychometric properties have been found to be satisfactory. 23 The Beck Anxiety Inventory (BAI), 24 of which a Brazilian version was also translated and adapted to Brazilian Portuguese, 22 is a self-report instrument for the assessment of general aspects of anxiety consisting of 21 items scored on a five-point Likert scale ranging from 0 to 4. It showed high internal consistency and test-retest reliability over one week. CD-Quest, BDI, and BAI were applied jointly and collectively in the classrooms. At least two members of the research team was available to clarify any student concerns and to answer questions. Data collection. This study was approved by the Institutional Review Board of the University Hospital, at Federal University of Bahia. Undergraduate students from two courses, medicine and psychology, were contacted. The subjects who agreed to participate in the study responded to the self-report instruments CD-Quest, BDI, and BAI in their classrooms, after signing the informed consent. The questionnaires were applied again 2 to 3 weeks later f or test-retest analysis. Data coding and treatment. The data were allocated to a data bank and submitted to statistical analysis using the R software. The demographic and clinical data of the sample under study were analyzed by applying descriptive statistics. The Student's t test was used for group comparisons. The following statistical procedures were applied for the study of validity/reliability of the CD- Quest: • Cronbach's alpha for the evaluation of the internal consistency of the scales—The Cronbach's alpha values considered to be acceptable were those exceeding 0.70. 25,26 • Pearson correlation coefficient (r) between the total scores of the CD-Quest, BDI, and BAI to assess the concurrent validity between scales—The interpretation of the magnitude of the correlations detected was defined as follows: 0 to 0.25, weak; 0.26 to 0.50, moderate; 0.51 to 0.70 strong; and above 0.71, very strong. 27 • Principal component analysis (PCA) with varimax rotation to assess the construct validity of the scales—The measure of sampling adequacy used was Kaiser-Meyer- Olkin index above 0.60; significant Bartlett's sphericity test, eigenvalues greater than one; and factor loadings greater than or equal to 0.40. 28 • Intraclass correlation coefficients were used for the analysis of test- retest reliability. 29 The level of significance was set at a p value of 0.05 or less in all analyses. RESULTS Frequency of the items and internal consistency. Each CD- Quest item was assessed individually, and the mean scores, SDs, and FIGURE 1. First page presentation of the CD-Quest