Is the reason for getting tested only available for positive outcomes? Wouldn't the percentage of positive outcomes where reason=app compared to reason=other be an interesting indicator of efficacy?
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. My (obvious) question based on this data would have been what the probability of finding 26 cases from an equally sized random sample of the app-using population during the given period would be.
Important point and a rough calculation: There were around 200 confirmed cases per day during the study period. Assuming they test positive for 10 days and a 2 to 5-fold underreporting, we get a #SARSCoV2 prevalence of 0.05% to 0.11% in the Swiss population.
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Between 860 and 2,150 persons would then need to get tested because of the app per day in order to find one positive case by chance, i.e., roughly 37 cases during the study period.
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However, there were only about 25 codes entered and 20 calls to the hotline per day, on average. So rather unlikely that the identified cases are a result of random testing.
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