Table 2.

Algorithm classification (1-lead ECG^a) versus cardiologist diagnosis (12-lead ECG).

Algorithm classification (Smartwatch 1-lead ECG)	Cardiologist diagnosis from 12-lead ECG
	Normal sinus rhythm, n	Atrial fibrillation, n	Other, n	Noise, n	Total, n
Normal sinus rhythm	109	3	9	0	121
Atrial fibrillation	0	77	11	2	90
Other	3	7	23	0	33
Noise	1	13	2	2	18
Total	113	100	48	4	262

^aECG: electrocardiogram.