“…First, groups are often recruited according to stringent inclusion criteria that are arbitrarily set and inconsistently applied across studies (Stuebing, Fletcher, Branum-Martin, Francis, & VanDerHeyden, 2012;Tolar, Fuchs, Fletcher, Fuchs, & Hamlett, 2014). For example, selection criteria for children with reading difficulties ranges from reading scores of -1 to -2.5 SD below the population mean (Barbot et al, 2016;Catts, Adlof, & Ellis, 2006). As a consequence, children included in one study may be excluded from others, yielding evidence that may not be generalisable to the broad, mixed population of children with learning-related difficulties (Coghill & Sonuga-Barke, 2012;Kotov et al, 2017).…”