Daily compliance behavior degree
A daily score for the usage time was created: 0 – patient did not used the trays; 1 – patient used the trays for the recommended time; 2 – patient used the trays for less than the recommended time; 3 – patient used the trays for more than the recommended time. The scores were then dichotomized into adequate (Score 1) or inadequate (Scores 0, 2, and 3). All data were registered daily. On all treatment days, each patient was analyzed and categorized according to the scores, so that 21 scores (days) were analyzed per patient.