Maarten van Egmond

126 Chapter 6 Feasibility outcome measures Feasibility outcome measures were calculated for the 15 patients that completed the 12-week supervised home-based telerehabilitation intervention. Feasibility outcomes included refusal rate; adherence to the telerehabilitation intervention operationalized in amount and duration of email, phone, and video calls conducted by patients and physiotherapists; treatment duration per session; adverse events; and patient satisfaction. Patient satisfaction was recorded with a modified telemedicine satisfaction and usefulness questionnaire (TSUQ), a 30-item Likert-type questionnaire including three subscales (usefulness, communication, and user friendliness) at 6 weeks postoperatively (T1) and at 3 months postoperatively (T2). 21 Scores range from 30 to 150, with high scores indicating a higher satisfaction. The telerehabilitation intervention was considered as feasible if at least 80% adherence rate was achieved, if no adverse events took place, and if the average total patient satisfaction was higher than 75% (score >120). Effectiveness outcome measures Secondary outcome measures on preliminary effectiveness were musculoskeletal and cardiovascular functioning and level of activities according to the domains of the International Classification of Functioning, Disability and Health. 22 Handgrip strength was measured with the Jamar grip strength dynamometer (Lafayette Instrument Company) as a measure of generalized muscle strength. 23,24 Maximal inspiratory pressure was measured as an indicator of inspiratory muscle strength, with a Micro Respiratory Pressure Meter. 2,4 Functional lower extremity muscle function was measured with the 30-second chair stand test (30CST). This test measures extremity strength in relation to demanding functional daily activities such as stair climbing and getting out of a chair. 25 Walking capacity was measured with the 2-minute walk test (2MWT). 26 Fatigue was measured with the Multidimensional Fatigue Inventory. 27 Self-reported activities were measured with the Longitudinal Ageing Study Amsterdam (LASA) physical activity Questionnaire (LAPAQ), in which patients reported the type, frequency, and duration of daily activities in the past 14 days. Health-related quality of life (HRQL) was measured with the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire C30, version 3.0. 28 Effectiveness of outcome measures were recorded before the start of the intervention (T0), and T1 and T2.