Table 1. Design of the twelve resulting problem versions implemented (Study 1).

		Context
		Breast cancer screening problem	HIV testing problem
Information format	Probabilities	Presentation of information • Text only • Tree only • Text and tree	Presentation of information • Text only • Tree only • Text and tree
	Natural frequencies	Presentation of information • Text only • Tree only • Text and tree	Presentation of information • Text only • Tree only • Text and tree