Baseline questionnaire
primary disease
The self-created baseline questionnaire included the demographic variables (age, gender, weight, duration on HD, primary disease of dialysis) and three questions on technical interest and physical condition which were rated on a 5-point Likert scale. The written questionnaire was answered by the patient at the time point before starting the interventions (t0). The baseline questionnaire was intended to minimize bias due to demographic variables and the three specific questions between groups.