“…Apart from the inclusion of sociodemographic and health-related information, optimism, measured as a personality trait, was selected to be included in the expanded model. Our rational for including optimism was based on previous research reporting associations between optimism and health-related behaviors (Robbins, Spence, & Clark, 1991;Steptoe, 1994), including mammography screening (Farmer, Reddick, D'Agostino, & Jackson, 2007). Furthermore, the majority of the studies that have incorporated personality traits within the TPB framework focus predominantly on general traits like the Big-Five factors (Conner & Abraham, 2001;Courneya, Bobick, & Schinke, 1999;Rhodes, Courneya, & Jones, 2002).…”