“…In the reports ( n = 47) providing items per PROM, there were a range from 3 to 390 items (median 34 items) [ 35 , 41 , 42 , 44 , 50 – 52 , 54 , 56 , 57 , 62 , 63 , 66 , 68 , 71 , 73 , 80 – 82 , 85 – 87 , 90 – 92 , 94 , 95 , 97 , 98 , 100 , 102 , 103 , 107 , 110 , 112 , 114 – 119 , 124 , 126 – 128 , 134 , 136 ]. In 30 reports, the number of items was missing for one or more of the identified PROMs, and a total number was not possible to calculate [ 36 , 43 , 45 , 48 , 49 , 55 , 58 – 61 , 65 , 67 , 70 , 75 – 77 , 83 , 93 , 99 , 104 , 106 , 108 , 109 , 120 , 122 , 123 , 125 , 130 , 132 , 133 ]. In ten studies, the number of items varied by age group or who chose to re...…”