“…Details of the definitions and formulae of all continuity of care measurement tools used in the reviewed studies are listed in Additional file 2 . The two most frequently used continuity of care instruments were the continuity of care index (CoCI) (20 studies) [ 7 , 10 , 13 , 18 , 25 , 26 , 29 , 33 , 39 – 41 , 45 , 47 , 53 – 56 , 59 – 61 ] and usual provider continuity index (UPCI) (12 studies) [ 27 , 36 – 38 , 42 , 44 , 45 , 48 , 49 , 52 , 56 , 58 ]. CoCI measures the dispersion of visits of a patient to different providers [ 63 ], which is calculated by , where k is the number of providers, is the number of visits to provider i and N is the total number of visits of the patient.…”