Table 1

Sensitivity and specificity at various potential upper alarm limits

	Agilent Viridia		Masimo SET		Nellcor Oxismart		Radiometer OSM3
Upper alarm limit (%)	Sensitivity	Specificity	Sensitivity	Specificity	Sensitivity	Specificity	Sensitivity	Specificity
92	0.99	0.12	1.00	0.16	1.00	0.10	1.00	0.23
93	0.99	0.18	0.99	0.21	1.00	0.12	1.00	0.30
94	0.96	0.21	0.98	0.31	0.98	0.18	0.99	0.38
95	0.93	0.30	0.94	0.45	0.95	0.26	0.99	0.46
96	0.86	0.43	0.83	0.54	0.90	0.45	0.95	0.62
97	0.72	0.55	0.68	0.72	0.70	0.63	0.87	0.79
98	0.48	0.69	0.36	0.82	0.58	0.74	0.64	0.92
99	0.30	0.81	0.23	0.93	0.34	0.85	0.25	0.98