Ewa Bulzacka1,2, John E Meyers3, Laurent Boyer2,4, Tifenn Le Gloahec1,2, Guillaume Fond1,2,5,6, Andrei Szöke1,2,5,6, Marion Leboyer1,2,5,6, Franck Schürhoff1,2,5,6. 1. Department of Psychiatry, AP-HP, Henri Mondor-Albert Chenevier Group, Créteil F-94000, France. 2. Fondation FondaMental (RTRS Santé Mentale), Créteil F-94000, France. 3. Private Practice, Mililani 96789, Hawaii. 4. Pôle psychiatrie universitaire, CHU Sainte-Marguerite, Marseille F-13274, France. 5. INSERM U955, Translational Psychiatry Team, Créteil F-94000, France. 6. Faculty of Medicine, University Paris Est-Créteil, Créteil F-94000, France.
Abstract
OBJECTIVE: This study assesses the psychometric properties of Ward's seven-subtest short form (SF) for WAIS-IV in a sample of adults with schizophrenia (SZ) and schizoaffective disorder. METHOD: Seventy patients diagnosed with schizophrenia or schizoaffective disorder were administered the full version of the WAIS-IV. Four different versions of the Ward's SF were then calculated. The subtests used were: Similarities, Digit Span, Arithmetic, Information, Coding, Picture Completion, and Block Design (BD version) or Matrix Reasoning (MR version). Prorated and regression-based formulae were assessed for each version. RESULTS: The actual and estimated factorial indexes reflected the typical pattern observed in schizophrenia. The four SFs correlated significantly with their full-version counterparts, but the Perceptual Reasoning Index (PRI) correlated below the acceptance threshold for all four versions. The regression-derived estimates showed larger differences compared to the full form. The four forms revealed comparable but generally low clinical category agreement rates for factor indexes. All SFs showed an acceptable reliability, but they were not correlated with clinical outcomes. CONCLUSIONS: The WAIS-IV SF offers a good estimate of WAIS-IV intelligence quotient, which is consistent with previous results. Although the overall scores are comparable between the four versions, the prorated forms provided a better estimation of almost all indexes. MR can be used as an alternative for BD without substantially changing the psychometric properties of the SF. However, we recommend a cautious use of these abbreviated forms when it is necessary to estimate the factor index scores, especially PRI, and Processing Speed Index.
OBJECTIVE: This study assesses the psychometric properties of Ward's seven-subtest short form (SF) for WAIS-IV in a sample of adults with schizophrenia (SZ) and schizoaffective disorder. METHOD: Seventy patients diagnosed with schizophrenia or schizoaffective disorder were administered the full version of the WAIS-IV. Four different versions of the Ward's SF were then calculated. The subtests used were: Similarities, Digit Span, Arithmetic, Information, Coding, Picture Completion, and Block Design (BD version) or Matrix Reasoning (MR version). Prorated and regression-based formulae were assessed for each version. RESULTS: The actual and estimated factorial indexes reflected the typical pattern observed in schizophrenia. The four SFs correlated significantly with their full-version counterparts, but the Perceptual Reasoning Index (PRI) correlated below the acceptance threshold for all four versions. The regression-derived estimates showed larger differences compared to the full form. The four forms revealed comparable but generally low clinical category agreement rates for factor indexes. All SFs showed an acceptable reliability, but they were not correlated with clinical outcomes. CONCLUSIONS: The WAIS-IV SF offers a good estimate of WAIS-IV intelligence quotient, which is consistent with previous results. Although the overall scores are comparable between the four versions, the prorated forms provided a better estimation of almost all indexes. MR can be used as an alternative for BD without substantially changing the psychometric properties of the SF. However, we recommend a cautious use of these abbreviated forms when it is necessary to estimate the factor index scores, especially PRI, and Processing Speed Index.
Authors: Gaurav H Patel; Sophie C Arkin; Daniel R Ruiz-Betancourt; Heloise M DeBaun; Nicole E Strauss; Laura P Bartel; Jack Grinband; Antigona Martinez; Rebecca A Berman; David A Leopold; Daniel C Javitt Journal: Psychol Med Date: 2020-06-05 Impact factor: 7.723