“…Seven studies did not report this information. Six studies used an indicator of complexity of the autism condition (Breik et al, 2018;Brown & Brown, 2014;Davignon et al, 2014;Duker et al, 2017;Nicholas et al, 2016;Strunk et al, 2014;Thomas et al, 2018), with the majority (n = 4) of these loosely classified as 'medium to high functioning' (Breik et al, 2018;Brown & Brown, 2014;Davignon et al, 2014;Strunk et al, 2014), owing to the different measures used. Six studies did not report on condition severity.…”