“…Surrogate measures of perseverance were reported for all quantitative (Adherence [28, 30, 31, 33, 35-38, 40, 43, 45-51, 53, 57, 58, 60, 64, 66-68], Dropouts [28, 31, 34, 36-38, 43, 44, 46, 49-51, 57, 58, 60, 62, 67, 68]) and mixedmethods studies (Adherence [29,32,41,42,55,56,61,63], Dropouts [41,61,63]). Factors perceived to influence perseverance were measured in 27 quantitative studies (Usability [50], Satisfaction [35,36,38,43,68], Motivation [34,40,44,45,50,51,64], UL Outcomes [28, 31, 33-38, 40, 43-51, 53, 57, 58, 60, 62, 64, 66-68]) and six mixed methods studies (Usability [56], UL Outcomes [29,41,42,55,56,63]).…”