A study of psychometric characteristies of SNAP-IV rating scale (parent's form) in elementary school students in Isfahan

This purpose of the present study was to determine the psychometric characteristics of SNAP-IV scale. The statistical population included the elementary students in Isfahan during 2009-2010. The sample was 500 students and sampling was done by random clustering at various stages. Measurement tools were SNAP-IV ranking scale (parents'' form)، ODDRS scale، and parents'' canners questionnaire. Results showed that the item-total correlations were between 0. 38 and 0. 63. Results of factor analysis showed that SNAP-IV rating scale is in fact multi-dimensional (attention deficit، hyperactivity/impulsiveness، and opposing defiant)، which determines 0. 37 of the variance. The reliability coefficients for the total scale، attention deficit، hyperactivity/impulsiveness، and opposing defiant were 0. 89، 0. 83، 0. 82، and 0. 80، respectively. Coefficient of correlation of this test and Canners rating scale for attention deficit was 0. 72. SNAP-IV rating scale is considered to be a multi-dimensional tool that is suitable for evaluation and measurement of ADHD and ODD disorders.