Conversion factors between different averaging times for events (SpO2 <80%) of arbitrary duration.

Tobs is the observed and Tdes the desired averaging time (s). For example, if 5 events/h had been counted with an averaging time of 16 s (Tobs), this number would have to be multiplied by 6.108 to get the number of severe events with an averaging time of 3 s (Tdes). In this case one would expect about 31 events with an averaging time of 3 s.