“…Among those studies that evaluated depressive symptoms via a validated questionnaire (Quality of Data Level 2) results were as follows: regarding symptoms severity, five studies (28% of subgroup) reported that individuals with TS had high severity depressive symptoms (Cunniff, Hassed, Hendon, & Rickert, 1995;Mao et al, 2015;Rickert et al, 1996;Rovet, 1993;Saad et al, 2014), 10 studies (56%) reported average severity symptoms (Chadwick, Smyth, & Liao, 2014;Freriks et al, 2015;Kiliç et al, 2005;Lagrou et al, 1998;McCauley, Ito, & Kay, 1986a;McCauley, Ross, Kushner, & Cutler, 1995;McCauley, Sybert, & Ehrhardt, 1986b;Ross et al, 1996;Rovet & Ireland, 1994;van Pareren et al, 2005), and three (17%) studies did not report data that were interpretable with regard to symptom severity (Lasaite, Lasiene, & Lasas, 2010;McCauley, Feuillan, Kushner, & Ross, 2001;Schmidt et al, 2006). Regarding symptom frequency, six studies (33%) demonstrated that subjects with TS were more frequently experiencing depressive symptoms as compared to those without TS (Chadwick et al, 2014;Kiliç et al, 2005;Lasaite et al, 2010;McCauley et al, 1986b;Saad et al, 2014;Schmidt et al, 2006), nine (50%) demonstrated an average frequency of symptoms (Cunniff et al, 1995;Freriks et al, 2015;Lagrou et al, 1998;McCauley et al, 1986aMcCauley et al, , 1995Rickert et al, 1996;Ross et al, 1996;Rovet & Ireland, 1994;van Pareren et al, 2005), one (6%) reported that individuals with TS were less frequently depressed than the i...…”