“…Attitudes were assessed in 88.9% of included studies, behavioural intentions in 37%, actual behaviour in a third of all included studies (33.3%), and a measure of knowledge of autism was included in just over a quarter (25.9%). Five studies assessed three outcomes (Campbell 2007;Gus 2000;Mavropoulou and Sideridis 2014;Ranson and Byrne 2014;Staniland and Byrne 2013), and nine reported data for a single outcome: attitudes (Cook 2017;Frederickson, Warren, and Turner 2005;Gardner et al 2014;James 2011;O'Connor 2016;Reiter and Vitani 2007); actual behaviour (Houston 1998;Owen-DeSchryver et al 2008); and knowledge (Scheil, Bowers-Campbell, and Campbell 2017). Of the remaining 13 studies, six assessed both attitudes and intended behaviour (Campbell et al 2004(Campbell et al , 2005Fleva 2014Fleva , 2015Morton and Campbell 2008;Silton and Fogel 2012;Swaim 1998;Swaim and Morgan 2001), six assessed both attitudes and actual behaviour (Collet-Klingenburg, Neitzel, and LaBerge 2012;Ezzamel 2016;Ezzamel and Bond 2017;Hughes et al 2013;Simpson and Bui 2016;Sreckovic 2015;Sreckovic, Hume, and Able 2017;Whitaker et al 1998), and one assessed knowledge and attitudes (Campbell et al 2019).…”