Table 1 The accuracy of pulse oximetry for diagnosing congenital heart disease in asymptomatic newborns for the commonest threshold of oxygen saturation <95%.

Test	No. of patients	Sensitivity, % (true positive rate) (95% CI)	Specificity, % (95% CI)	False positive rate (%) (95% CI)
Saturation* ⩽95% foot	11 281	60.0 (14.7 to 94.7)	100 (100 to 100)	0
Saturation* ⩽95% foot or hand	2114	66.7 (9.4 to 99.2)	99.9 (99.7 to 100)	0.1 (0 to 0.3)
Saturation* ⩽95% foot	3262	96.8 (73.6 to 100)	99.7 (99.5 to 99.9)	0.3 (0.1 to 0.5)
Saturation† <95% foot	5626	25.0 (12.7 to 41.2)	99.6 (99.4 to 99.7)	0.4 (0.3 to 0.6)
Saturation* ⩽95% foot	5292	66.7 (9.4 to 99.2)	100 (99.9 to 100)	0 (0 to 0.1)
Saturation† <95% hand and foot	5211	30.8 (9.1 to 61.4)	100 (99.9 to 100)	0 (0 to 0.1)
Saturation* <95% foot	2733	75.0 (57.8 to 87.9)	87.9 (86.6 to 89.1)	12.1 (10.9 to 13.4)
Saturation* <95% foot	266	89.4 (79.4 to 95.6)	99.0 (96.4 to 99.9)	1.0 (0.1 to 3.6)
Summary estimate	35 785	63.4 (38.7 to 82.5)	99.8 (99 to 100)	0.2 (0 to 1)

*Functional oxygen saturation; †fractional oxygen saturation.