Ann: ResApp Provides SMARTCOUGH-C-2 Study Update, page-34

In the teleconference they reported that over 70% of the sampled recordings (i.e. the ones they'd listened to) were audibly affected by background noise including televisions, conversations, medical equipment, other patients coughing, and even in some cases "coaching" coughs from parents or staff.

My understanding is that they investigated to the point where they were confident that they'd identified all the distinct causes of sound quality and didn't waste time beyond that.

Not all issues last year were related to data quality. There were also issues with the protocol. Asthma patients were treated already before they were tested by ResappDx. Given that Ventolin has almost immediate effect there was effectively nothing for ResappDx to detect. And finally as the comparison tests were adjudicated by different teams using different criteria there was no stable baseline for measuring results in some of the conditions.