“…Factor analysis revealed a 6-factor structure: Behavior/ Emotions not Optimally Tuned to the Social Situation (Not tuned, 11 items, α=0.84), Reduced Contact and Social Interests (Reduced Contact, 12 items, α=0.76), Orientation Problems in Time, Place or Activity (Orientation, 8 items, α= 0.78), Difficulties in Understanding Social Information (Social Understanding, 7 items, α=0.75), Stereotyped Behavior (Stereotyped, 8 items, α=0.69), and Fear and Resistance to Change (Fear of Change, 3 items, α=0.74). Several studies have supported the factorial structure (Hartman, Luteijn, Serra, and Minderaa 2006;Luteijn et al 2000a) and criterion validity of the CSBQ, in children with and without mental retardation (De Bildt et al 2005;de Bildt et al 2009;Hartman et al 2006;Luteijn et al 2000b). The CSBQ differentiates between (DSM-IV based) autism, PDD-NOS and ADHD, with decreasing scores for these three conditions, respectively (Hartman et al 2006).…”