Table 2. Results for Fitbit charge HR. |
|
Aggregate Data (n = 87 340) |
Data above ECG HR >116bpm (n = 41 315) |
Data below ECG HR <117bpm (n = 46 025) |
FB Mean HR, bpm (±SD) |
108(29) |
130(25) |
89(15) |
ECG Mean HR, bpm (±SD) |
117(29) |
142(19) |
94(14) |
Mean Absolute Difference, bpm (±SD) |
11(16) |
14(20) |
8(9) |
Mean Absolute Difference, % (±SD) |
9.8 (14.0) |
11.3 (17.0) |
8.5 (10.4) |
Correlation (r) |
.83* |
.58 * |
.73 * |
Mean Bias, bpm (±SD) [95% CI] |
-9(17) [-9, -9] |
-13(21) [-13, -13] |
-5.3(11) [-5, -5] |
95% Limits of Agreement (Upper, Lower) |
24, -42 |
29, -54 |
16, -26 |
Standard Error of the Estimate (SEE) |
16 |
20 |
10.0 |
|
FB = Fitbit Charge HR, SD= standard deviation, ECG= electrocardiograph, HR= heart rate, CI= confidence interval, n= per second ECG and FB data pairs. |
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