Table 2.

Test performance characteristics for personal fitness tracker detection of tachycardia, as compared to SPO2-R

	Sinus rhythm	Atrial fibrillation
Sensitivity	0.695	0.516
Specificity	0.988	0.995
Positive predictive value	0.948	0.983
Negative predictive value	0.914	0.804
Accuracy	0.92	0.836