“…A total of 6/11 studies reported negative effect include the following: Gottfredson et al, 2020, Ryan et al, 2018, Fisher et al, 2016, Schlosser et al, 2014, Na et al, 2013 and Sloboda et al, 2009 [ 14 , 16 , 17 , 18 , 19 , 20 ]. One study, Javdani, 2019 [ 15 ], reported both negative and null/no effect 4/11 studies reported null effect (Gist, 1995, Lynam et al, 1999, West and OâNeal, 2004 and Pan and Bai, 2009) [ 21 , 22 , 23 , 24 ].…”