TABLE 1 Accuracy of Fitbit and Apple watch for the various rhythms

	Number of rhythms	Accuracy ratio (±10%) Fitbit	Delta (FB HR—True HR)	Accuracy ratio (±10%) apple	Delta (AW HR—True HR)
Regular	121 (37.5%)
Sinus Rhythm (HR 40–150)	46 (38.0%)	40 (86.9%)	2.83 ± 11.83	46 (100%)	0.7 ± 2.2
SVT (HR 100–200)	44 (36.3%)	38 (86.3%)	‐ 8.75 ± 25.52	39 (88.6%)	‐ 8.32 ± 24.86
VT (HR 100–261)	31 (25.6%)	18 (58.0%)	‐ 38.19 ± 49.14	21 (67.7%)	‐ 35.97 ± 53.85
VT HR < 180	22 (18.8%)	18 (81.8.%)	−11.05 ± 23.52	21 (95.4%)	−3.82 ± 17.02
Onset	65 (20.1%)
SVT (HR 100–200)	28 (43.0%)	11 (39.2%)	‐ 29.18 ± 34.61	24 (85.7%)	‐ 9.79 ± 26.88
VT (HR 100–286)	37 (56.9%)	6 (16.2%)	‐ 71.51 ± 57.5	15 (40.5%)	‐ 63.57 ± 63.23
VT HR < 180	25 (38.46%)	6 (24%)	‐ 34.0 ± 39.96	15 (60%)	‐ 1.50 ± 43.11
Termination	66 (20.5%)
SVT (HR 41–140)	37 (56.1%)	15 (39.4%)	18.5 ± 20.32	23 (60.5%)	5.43 ± 8.06
VT (HR 27–169)	29 (43.9%)	9 (31%)	14.34 ± 36.71	12 (41.3%)	7.28 ± 32.48
Irregular rhythms	66 (20.5%)
AF (HR 56–194)	28 (42.4%)	10 (39.4%)	−19.92 ± 28.27	11 (60.5%)	−17.96 ± 31.76
VF (HR 171–430)	10 (15.1%)	0	−110.2 ± 60.37	0	−91.8 ± 61.91
VPC (HR 50–112)	11 (16.6%)	6 (54.5%)	−58.5 ± 41.85	6 (54.5%)	−65.5 ± 43.15
NSVT (HR 102–197)	17 (25.7%)	3. (17.6%)	−7.36 ± 19.28	2 (11.7%)	−7.5 ± 16.09
Pause >3 seconds and CHB	4 (0.01%)	0	17.12 ± 19.32	0	−13.8 ± 24.48

Note: Data are represented as n (%), mean ± SD.