“…The collection of normative statistics provides data for the testing of the validity of the instrument (Cicchetti, 1994), determines the effectiveness of the instrument to discriminate between the target and normal populations (Golombok & Rust, 1993), and increases the robustness and reliability of the measurement (Friedrich, Gramsch, Damon, Hewitt, Koverola, Lang, Woplfe, & Broughton, 1992). Discriminant validity provides a context for the interpretation of scale scores (Malic, Ivnik, Smith, Tangalos, Peterson, Kokmen, & Kurland, 1992;Sharma, Botzet, Sechrist, Arthur, & Winters, 2006), and enables researchers and practitioners to make meaningful and valid interpretations of within-and betweengroup comparisons (Apolone & Masconi, 1998;Cicchetti;Cooke, et al, 2006;Gandek & Ware, 1998;Golombok & Rust).…”