“…All studies examined usage data in some aspects of their evaluation, and most papers were ascribed to one or more of the following constructs: user adherence [ 40 , 46 , 49 - 51 , 53 , 55 , 62 , 64 , 75 , 80 , 82 , 85 ], engagement [ 47 , 48 , 52 , 56 , 61 , 65 , 67 , 77 , 79 , 84 ], or acceptability [ 45 , 57 , 71 ]. Although adoption was included in our search, none of the reviewed studies used analytics as a proxy to measure that indicator.…”