“…In a meta-analytic review of studies on self-serving attributional bias, Mezulis and colleagues (2004) concluded that, in the general population, the level of positivity bias in attributions was the lowest in early adolescence (12-14 years of age) when a person starts realizing that frequent failures can be the result of lower abilities. The obtained findings indicating the absence of significant age differences in self-efficacy are supported by the results of previous studies (Gresham et al, 1988;Payne & Jahoda, 2004). Similarly, the results which refer to sense of relatedness are consistent with the findings of other authors according to which, in persons with ID, there were no significant age differences in social skills (Adeniyi & Omigbodun, 2016;Heiman & Margalit, 1998), peer acceptance and relations (Heiman & Margalit, 1998;Wendelborg & Kvello, 2010), and perceived social support (Lunsky & Benson, 2001).…”