Table 3.

An overview of the prototypes developed.

Prototype group	Interface	Overview of structure	Overview of content	Overview of media
1. Side effects	Website—main page links to either a child or an adult's site	Child. One page	Basic child's site (one page) containing a video for download	Animation with emoticon
		Adult. Page split into 5 main (linked) sections with link to a sub-page detailing side effects	General information/FAQ	Video (multilingual)—doctor providing information
			Risks and side effects of vaccination	Text description with LINK to photos; contact details of doctor (phone/e-mail)
			What to say to the doctor (allergies)	Text description and photos
			What to do on the day of the vaccination	Text description
			Benefits of vaccination	Text description; LINK to “contact doctor”
2. Privacy	Mobile phone app	5 (linked) pages	Why is your consent important?	Text
			Who is holding my information?	Text and link to OPBG and vaccine society websites
			Are you free to withdraw from participating?	Link to details on how to withdraw
			Can I have access to my data?	Text and link to OPBG
			Check that everything is understood and consent	Checkbox
3. Vaccine administration	Paper or phone app	Text split into 5 sections, and calendar	Introduction explaining where the vaccine is being administered	Text
			When and how is the vaccine administered?	Text
			How will analyses be done?	Text
			Calendar	Calendar
			Next contact with researchers	Text
4. Sexual health	Paper	Text with 5 headings	What is HPV?	Text
			The vaccine	Text
			Who should be vaccinated?	Text
			Contraindications	Text
			To participate in the study	Text