A study of psychometric characteristies of SNAP-IV rating scale (parents’ 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. Conclusion: SNAP-IV rating scale is considered to be a multi-dimensional tool that is suitable for evaluation and measurement of ADHD and ODD disorders