Table 1

Predictive Value of NMU-PO

NMU-PO	MU-PO		Totals	Predictive Vaue, %	95% CI, %
NMU-PO	Hypoxemia Present, n (Classification)	Hypoxemia Absent, n (Classification)	Totals	Predictive Vaue, %	95% CI, %
SpO₂ <90%	12 (true positive)	24 (false positive)	36	33^a	24-44
SpO₂ ≥90%	3 (false negative)	630 (true negative)	633	99^b	98-100
Totals	15	654	699

Note: Hypoxemia present is defined as SpO2 <90% and hypoxemia absent is defined as SpO2 ≥90%.
MU-PO = medical use pulse oximeters; NMU-PO = nonmedical use pulse oximeters; SpO2 = oxygen saturation.
↵a Positive predictive value.
↵b Negative predictive value.