“…Since 2000, the bifactor model of ADHD has received vast support, with ADHD as a general factor and specific factors for inattention and hyperactivity/impulsivity (e.g., Caci, Morin, & Tran, 2016). More recently, there has been considerable interest in whether sluggish cognitive tempo (SCT), a construct comprising symptoms such as daydreaming, confusion, and apathy (e.g., Becker, Burns, Schmitt, Epstein, & Tamm, 2017;Hartman, Willcutt, Rhee, & Pennington, 2004) is a dimension of ADHD or a separate psychopathology. Lee, Burns, Beauchaine, and Becker (2016) and Garner et al (2017) found support, through bifactor modeling, for SCT as a distinct construct, although strongly and positively correlated with inattention.…”