Abstract
We launched a study to develop an online contraception decision aid to address the unique needs of TGNC AFAB individuals. Guided by user-centered design principles, we developed a prototype tool and conducted a preliminary evaluation that showed good system performance (94% accuracy and positive assessment of usefulness/usability). This research fills a critical knowledge gap, advocates health equity for gender-minority groups, and develops guiding principles for engaging them in participatory design of digital health tools.