Performance statistics.

Descriptive statistics for all, darkly, and lightly pigmented participants. All comparisons were to invasive reference measurements. The LED-based devices (Rad-97 and PM1000N) were compared to functional saturation and the laser-based devices were compared to fractional saturation, to match how these devices were calibrated. Note, results for the laser-based devices were for the data from all four of the laser-based pulse oximeters combined.