“…This study showed an impact of IQ on inattentive symptoms, similar to previous studies that suggested a correlation between the inattentive ADHD subtype and fluid intelligence that is not found for hyperactivity/impulsivity subtypes (Costa et al, 2014; Vaida, Mattoo, Wood, & Madhosh, 2013). However, in the present sample, there was no effect of estimated IQ on the ADHD general score, in contrast with previous literature that consistently demonstrated that adults and children with ADHD have lower levels of psychometrically measured intelligence than non-ADHD controls (Hervey, Epstein, & Curry, 2004; Kuntsi et al, 2004; Rapport, Scanlan, & Denney, 1999; Rommel, Rijsdijk, Greven, Asherson, & Kuntsi, 2015).…”