15250-m-cuypers

32 Chapter 2 different depending on the selected treatment, linear regression analyses were repeated per treatment group (active surveillance, surgery, radiotherapy). Multicollinearity was checked in all relevant analyses. All analyses were performed using SPSS version 20.0 (Statistical Package for Social Sciences, Chicago, IL, USA). P -values <.05 were considered statistically significant. 3. RESULTS The questionnaire was completed by 562 participants (71%). Non-responders were older than responders (mean 68.9 vs. 66.5, p <.001), men with unverifiable addresses did not differ in age compared to responders. Also, no group differences were found in tumor stage between respondents, non-respondents and patients with unverifiable addresses ( p =.306). Questionnaires were filled in with a median of 48 months since diagnosis. Time since diagnosis was not correlated to decision-making role preferences, ( r (612) = .059, p = .141. 3.1 Univariate results Fifty-nine percent of the responders preferred a collaborative decision-making (CDM) role, whereas 19% preferred a passive (PDM) role and 22% preferred an active (ADM) role. Men with a preference for a PDM role were on average older, had lower education levels and more often had a lower socio-economic status (SES), compared to men with a CDM or ADM role preference (Table 1). Menwithapreference for anADMrolehadmoreoften received surgery or brachytherapy as initial treatment, while men with a preference for a PDM role had more often received active surveillance or external radiation therapy ( p <.001). Role preferences were not related to clinical characteristics (tumor stage and Gleason score) or marital status (Table 1).