Saskia Briede

A patient’s perspective on care decisions 91 4 No Item Response Participant selection 10. Sampling Participants were selected using convenience sampling. Participants that had received the patient education in a clinical setting (i.e. the intervention group of the previous study) were approached for participation. 11. Method of approach Participants were approached by telephone. 12. Sample size 44 participants (34 in the first round, 10 in the second round) 13. Non-participation Of the 62 patients that were approached for this study, 13 did not want to participate, 3 could not be reached, and 2 did not answer the telephone at the scheduled interview time. (See figure 1). Setting 14. Setting of data collection Data was collected by telephone. 15. Presence of nonparticipants No non-participants were present. 16. Description of sample Of the 44 patients, 25 were male (56,8%) and 19 female (43,2%). The median age was 57,5 years (interquartile range 53-67,5) and they had a median Charlson Comorbidity Index of 2,5 (interquartile range 1-4) 17. Interview guide We provided the interview guides (appendix 2) Data collection 18. Repeat interviews No repeat interviews were carried out. 19. Audio/visual recording Interviews were audio-recorded, downloaded onto a secure folder at the UMC Utrecht network, and subsequently deleted from the recording device. The interviews were transcribed by NB and AB and checked by SB for accuracy. 20. Field notes No field noted were collected. 21. Duration Interview duration was on average 15-20 minutes. 22. Data saturation Not applicable. 23. Transcripts returned Transcripts were not returned to participants. Domain 3: analysis and findings Data analysis 24. Number of data coders Two of the researchers (SB and NB) coded the data. 25. Description of the coding tree No coding tree was used as subthemes and themes were inductively derived from the data. 26. Derivation of themes Themes were derived from the data. 27. Software NVivo 12 software 28. Participant checking Participants did not provide feedback on the findings.

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