“…Predictors of exercise adherence were grouped into the following clusters: demographic, psychological, program-related, medical condition severity, comorbidities, and other. Demographic factors were evaluated by 13 studies(25, 28-32, 35, 36, 38, 40, 41, 43, 44) (Table 2), psychological factors by 14 studies(22, 24, 25, 27-31, 34, 36, 38, 40, 41, 43, 44) (Table 3), program-related factors by 7 studies,(22,26,29,33,35,37,39) medical condition severity by 11 studies,(24, 28-31, 38, 40-44) comorbidities by 8 studies(24,25,27,32,36,40,41,43) and other predictors by 5 studies (22,31,35,42,43). Similar factors were investigated between exercise indications (seeSupplementary Tables S3, S4, S5; Additional Files 3, 4, 5), however more functional measures to quantify lung function were used as potential predictors of adherence among pulmonary rehabilitation studies, while more disease characteristics and history measures were used among cardiac rehabilitation studies.…”