Table 3. Correlations and Bland-Altman findings for push counts recorded by the Apple Watch® compared to direct observation (n = 24).
| Measurement Method |
Mean Push Counts SD (range of pushes) |
Pearson’s Correlation Coefficient (95% CI) |
Push Counts Mean Difference (SD) |
Upper LoA | Lower LoA |
|---|---|---|---|---|---|
| Apple Watch® | 882 ± 239 (479–1392) |
.840* (0.66–0.93) |
−103 (163) |
217 | −423 |
| Direct Observation | 985 ± 300 (637–1978) |
SD, standard deviation; CI, confidence interval; LoA, limits of agreement as determined by Bland-Altman Method.
*significant to P < 0.001.