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. 2021 Mar 25;9(3):e25313. doi: 10.2196/25313

Table 3.

The mean absolute percentage error for each participant for Polar OH1 and Fitbit Charge 3 across all available data points.

Participant	Polar OH1 (%)	Fitbit Charge 3 (%)
1	0.22	6.34^a
2	−3.92	5.30^a
3	1.37	2.80
4	0.06	2.06
5	0.31	4.01
6	1.70	1.53
7	0.22	2.35
8	−0.44	2.59
9	0.71	3.14
10	−0.09	2.83
11	0.59	-3.25
12	1.81	4.00
13	−0.10	3.91
14	−0.09	−5.43^a
15	0.69	14.90^a
16	0.87	5.97^a
17	0.19	2.75
18	1.18	11.40^a
19	2.58	15.80^a
Overall	0.41	4.37

^aExceeds 5% mean absolute percentage error threshold.