Fig. 7: Histograms of all individual SpO2 values collected from the full subject cohort.
From: Pulse oximetry values from 33,080 participants in the Apple Heart & Movement Study

a Distribution counts shown with linear y-scale. b Distribution counts shown with logarithmic y-scale. The two histograms represent identical data, but with differing y-scales to enable useful visualization of the value distribution for SpO2 < 85%.