Table 3.
Repeated measures correlation (RMC), mean absolute percentage error (MAPE), and mean difference for each Polar Vantage watch and Oura ring variable.
| Measure | Person-days, n | RMCa (95% CI) | MAPE | Mean difference (lower LoAb, upper LoA) | |
| Polar Vantage watch | |||||
|
|
Steps | 57 | 0.75 (0.54-0.92) | 72 | 4091 (−2693, 10 876) |
|
|
MVPAc | 57 | 0.76 (0.62-0.88) | 143 | 59 (−148, 266) |
|
|
Total energy expenditure | 57 | 0.69 (0.48-0.88) | 19 | 430 (−267, 1127) |
|
|
Sleep duration | 48 | 0.74 (0.56-0.88) | 11 | −30 (−183, 123) |
| Oura Generation 2 ring | |||||
|
|
Steps | 68 | 0.77 (0.62-0.87) | 69 | 3779 (−3361, 10 919) |
|
|
MVPA | 68 | 0.70 (0.49-0.82) | 49 | −18 (−96, 61) |
|
|
Total energy expenditure | 68 | 0.70 (0.51-0.83) | 13 | 148 (−624, 920) |
|
|
Sleep duration | 44 | 0.82 (0.68-0.91) | 11 | 6 (−152, 164) |
|
|
Resting heart rate | 39 | 0.90 (0.85-0.96) | 3 | −1 (−4, 1) |
aAll RMC P values are <.001.
bLoA: limit of agreement.
cMVPA: moderate-to-vigorous physical activity.