Supplementary Material for: Implementing Medical Chatbots: An Application on Hidradenitis Suppurativa

Background: The use of digital health resources is growing quickly as they are easily accessible and permit self-evaluation. Yet, research on consumer health informatics platforms is insufficient. Chatbots, interactive conversational platforms based on artificial intelligence, can facilitate access to specific information. Hidradenitis suppurativa (HS) is burdensome and has a high threshold for consultation. Objectives: We aimed to identify the most important principles for the assembly of medical chatbots through the analysis of usage data. Methods: The HS Chatbot1 is a question-and-answer platform in the style of a chatbot. Usage data were collected over the course of a year. 254 responses were statistically analysed. Results: 239 users were alleged patients. 82.9% were looking for a tentative diagnosis. The users were on average 32.49 (±11.33) years old and predominantly female (70.2%). The average number of clicks per visit on the website was 14.69 (±8.83). Conclusions: A medical chatbot has to be customised to the specific subject whilst general principles have to be considered. High-quality information has to be available in just a few clicks. People concerned about HS are looking for a diagnosis online and often have not seen a doctor previously. Guidance towards appropriate care should be provided.