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. 2020 Dec 16;10(12):e040269. doi: 10.1136/bmjopen-2020-040269

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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App breadth of coverage—that is, the proportion of vignettes for which condition suggestions and levels of urgency advice were provided. When condition suggestions or urgency were not provided, the principal reason for this is shown, or alternatively ‘no results’ when no reason was given. conditions given—condition suggestions were provided by the app; mental health—mental health vignettes where no condition suggestions/urgency advice was provided; no results—the app provided a clear statement that no condition suggestion results were found for the vignette (the reason why the app failed to give a condition suggestion for these vignettes is uncertain, but generally these vignettes relate to minor conditions, and in most cases it seems that the app does not have a matching condition modelled); generic—the app gave a generic answer rather than a condition, for example, ‘further assessment is needed’; symptom not found—a directly or appropriately matching symptom to the presenting complaint could not be found in the app so the vignette could not be entered; severity—the app did not to give condition-suggestions for very serious symptoms—for example, the app stated only ‘Condition causing severe (symptom)’; pregnant, vignettes for which no condition-suggestions/urgency advice was provided by the app as the patient was pregnant; under age—vignettes for which no condition suggestions/urgency advice was provided by the app as the patient was under its specified age limit; advice given—level of urgency advice was provided by the app; not recorded—one app-entry-Dr (#4) did not fully record the levels of urgency advice, and there were no corresponding source data verification screenshots for this subset of data (see online supplemental table 6 for a subanalysis of the 150 vignettes with complete source-data-verified data for K Health on levels of urgency advice); no conditions—no condition suggestions were provided by the app, and, as a result of this, the app did not provide urgency advice. See online supplemental tables 8–10 for details.