The PANASN (Sandin, 1997) is a version of the Positive and Negative Affect Schedule (PANAS; Watson, Clark y Tellegen, 1988) for use with children an adolescents. In this study we present data concerning factor structure, reliability and validity of the PANASN in a sample of nonclinical participants (aged 12-17 years; N = 535). Support is provided for the twodimensional structure of the measure (i.e., positive and negative affect), as well as, for its reliabilily, and convergent and discriminant validity with existing self-report measures of childhood anxiety and depression. The possible relevance of this instrument to differentiate anxiety from depression in youngsters is discussed.