112 | Chapter 4 Knowledge Test The Cronbach’s alpha was 0.807, indicating a high level of internal consistency among the items. At T1, patients on average answered 47.2% (SD 19.9%) of the questions on the knowledge test correctly. RT knowledge was best (69.4% correct, SD 28.8%), while TL knowledge was poorest (34.5% correct, SD 28.85%). Six months after treatment (T2), the mean total correctly answered questions slightly increased to 51.9% (SD 23.8%). Regarding different treatment groups, TL patients had the highest median score for the overall number of correct answers (60%, range 20%-85%) and the CRT group the lowest overall score (median 43%, range 15%-85%). The lowest level on knowledge was seen on the questions regarding TL (range of medians 25-38%). See appendix A for all the results. Shared Decision-Making Patients’ perceived level of SDM was 70.32 (mean, SD 16.22) at T1. Physicians scored a mean of 69.97 (SD 1.71). The mean difference between the SDM scores of patients and physicians was -0.272 (SD 21.53), but this difference was not significant (p=0.75). Control Preference Scale Most patients (34/45, 76%) preferred sharing responsibility with their treating physician (statement 2, 3 and 4). Ten patients (22%) wanted their physician to make the treatment choice (statement 5), and one patient (3%) preferred to make the final decision alone (statement 1). See table 3 for the statements and results. At T2, more patients preferred a certain level of SDM during decision-making (23/25, 92%). The same patient still would have made the treatment choice on his own, and there was a decrease to one patient that would have left the choice to the treating physician. This difference in time points was not significant (p=0.07). Spearman correlations DCS The level of perceived SDM by patients and doctors was weakly positively correlated with DC, suggesting that more experienced SDM (higher scores on the SDM questionnaire) leads to more DC in this patient selection (see table 4). No other correlations were found.
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