. 2022 Aug 18;14:1427–1436. doi: 10.2147/NSS.S367400

Table 3.

The Performance of Reported PPG Based Oximetry for Sleep Apnea Testing in Detecting Suspected OSA

Study	Portable Monitoring	PPG Technology	N	AHI Threshold	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
Gu et al, 202017	Belun Ring	rPPG	50	AHI≥5	95	29	89.1	50
Gu et al, 202017	Belun Ring	rPPG	50	AHI≥15	85	87	88.5	65.5
Massie F et al, 201819	NightOwl	rPPG	101	AHI>≥5	92	100	56	100
Massie F et al, 201819	NightOwl	rPPG	101	AHI≥15	94	87	89	92
Papini G B et al, 202020	Wrist-worn oximetry	rPPG	502	AHI≥5	72	71	84	NR
Papini G B et al, 202020	Wrist-worn oximetry	rPPG	502	AHI≥15	59	90	75	NR
Ayas N et al, 200321	Watch-PAT	tPPG	30	AHI≥15	93.3	73.3	NR	NR
Romem A et al, 201418	Morpheus Ox	tPPG	65	AHI≥5	80	86	93	68
Romem A et al, 201418	Morpheus Ox	tPPG	65	AHI≥15	70	91	80	85
Our data	Circul	rPPG	207	AHI≥5	87	83	96	57
				AHI≥15	66	96	97	62

Abbreviations: PPG, photoplethysmography; rPPG, reflective photoplethysmography; tPPG, transmissive photoplethysmography; PPV, positive predictive value; NPV, negative predictive value; AHI, apnea-hypopnea index; NR, not reported.