This study investigates whether the design of weblinks in digital vaccination invitations affects how much people trust the message and their willingness to book an appointment. Researchers compare a standard third-party weblink used by the NHS ("accurx.thirdparty.nhs.uk/r/aafwaczmd5") with an improved, more transparent weblink (https://vaccine-booking.nhs.uk).
The study tests the hypothesis that the improved link will be perceived as more trustworthy and easier to read than the standard link. Further, the study tests whether participants would be more likely to correctly identify the sender and would be more willing to book a vaccine when shown the improved link.
To test these effects, the investigators planned to conduct a study with 600 participants from the United Kingdom and 600 from the United States. Participants will be randomly assigned to view one of the two hypothetical email versions. UK participants will see an email that appears to be from the NHS. US participants will see an email from a fictitious pharmacy (Pharma-US).This research aims to provide evidence on how to design more trustworthy digital health communications when recipients are asked to click a weblink.