Explosive sound

0.5 second audio snippet captured by the app (coughs and non-coughs).

Non-onboarding elicited coughs

Forced or voluntary coughs collected via the "Solicit coughs" feature.

Onboarding coughs

The initial coughs collected from a participant at enrollment, prior to "longitudinal" monitoring.

Longitudinal coughs

The cough collected during continuous monitoring period after onboarding.

Onboarded participant

Participant for whom at least 3 onboarding coughs have been registered.

Longitudinally activated participant

Participant for whom at least 5 minutes of longitudinal tracking has been registered.


A signal, generated every ten minutes, to indicate that the app is actively tracking coughs longitudinally (used to determine tracked person-time).