Questionnaire sent to patients

The patient information, informed consent form and questionnaire will collectively be distributed digitally or by mail to all patients.

Digital health literacy Instrument (DHLI) 2.0 has 24 self-report items. People score how difficult they perceive certain tasks to be and how often they experience certain problems on the Internet. Each item was scored on a 4-point scale, with response options ranging from "very easy" to "very difficult" and from "never" to "often." Scores are reversed, so that a higher score represented a higher level of digital health literacy.

This is a questionnaire with items assessing health visualization literacy. People are shown 20 visualizations with information about their disease and answer a question to test if they understood the information in the visualization. The scores consist of number of right answers, so a higher score represent better digital health visualization.