BACKGROUND: In international research on the consequences of psychiatric illnesses for relatives of patients, the need for an internationally standardised measure has been identified. AIMS: To test the internal consistency and the test-retest reliability of the Involvement Evaluation Questionnaire (IEQ) in five European countries. METHOD: The IEQ was administered twice to a sample of relatives or friends of patients with an ICD-10 diagnosis of schizophrenia. Reliability was tested using Cronbach's alpha, intraclass correlation coefficients and standard error of measurement. Reliability estimates were tested between sites. RESULTS: Test sample sizes ranged from 30 to 90 across sites, and retest sample sizes ranged from 21 to 77. Cronbach's alpha values of IEQ sub-scales and sumscore were substantial at most sites; but at two, alpha values were moderate. Intraclass correlation coefficients were substantial to high at all sites. The standard errors of measurement differed across sites, indicating differences in performance. CONCLUSION: The reliability of the IEQ in five languages varies across sites, but is sufficiently high in at least four out of five.
BACKGROUND: In international research on the consequences of psychiatric illnesses for relatives of patients, the need for an internationally standardised measure has been identified. AIMS: To test the internal consistency and the test-retest reliability of the Involvement Evaluation Questionnaire (IEQ) in five European countries. METHOD: The IEQ was administered twice to a sample of relatives or friends of patients with an ICD-10 diagnosis of schizophrenia. Reliability was tested using Cronbach's alpha, intraclass correlation coefficients and standard error of measurement. Reliability estimates were tested between sites. RESULTS: Test sample sizes ranged from 30 to 90 across sites, and retest sample sizes ranged from 21 to 77. Cronbach's alpha values of IEQ sub-scales and sumscore were substantial at most sites; but at two, alpha values were moderate. Intraclass correlation coefficients were substantial to high at all sites. The standard errors of measurement differed across sites, indicating differences in performance. CONCLUSION: The reliability of the IEQ in five languages varies across sites, but is sufficiently high in at least four out of five.
Authors: Manuel Gonçalves-Pereira; Miguel Xavier; Bob van Wijngaarden; Ana L Papoila; Aart H Schene; José Miguel Caldas-de-Almeida Journal: Soc Psychiatry Psychiatr Epidemiol Date: 2012-05-31 Impact factor: 4.328
Authors: Muhammad Ajmal Zahid; J U Ohaeri; A S Elshazly; M A Basiouny; H M Hamoda; R Varghese Journal: Soc Psychiatry Psychiatr Epidemiol Date: 2009-09-02 Impact factor: 4.328
Authors: Josune Martín; Angel Padierna; Urko Aguirre; José M Quintana; Carlota Las Hayas; Pedro Muñoz Journal: Qual Life Res Date: 2011-03-04 Impact factor: 4.147