Table 3.
Agreement between steps derived by the activPAL and steps derived by the Verisense algorithms applied to wrist accelerometer data.
| Outcome | SMART Work and Life | Equivalency | STAND UP | Overall |
|---|---|---|---|---|
| N | 640 | 46 | 27 | 713 |
| N valid days | 4.9 (4.7, 5.0) | 2.1 (1.8, 2.4) | 3.9 (3.2, 4.6) | 4.7 (4.5, 4.8) |
| ActivPAL steps | 9369 (9117, 9622) |
10,345.3 (8924, 11,767) |
7282.7 (6214, 8352) |
9352.2 (9103, 9601) |
| Verisense original algorithm (1) | ||||
| Verisense steps | 10,239 (10,025, 10,454) |
10,829 (9723, 11,935) |
9922 (9052, 10,792) |
10,265 (10,058, 10,472) |
| Mean difference to activPAL | +870 (730, 1009) |
+501 (−311, 1313) |
+2639 (1789, 3490) |
+913 (772, 1054) |
| 95% LoA’s | −2648, 4388 | −4860, 5861 | −1573, 6852 | −2837, 4663 |
| Verisense refined algorithm (2) | ||||
| Verisense steps | 10,056 (99,796, 10,316) |
11,269 (10,017, 12,521) |
8975 (7969, 9981) |
10,093 (9844, 10,344) |
| Mean difference to activPAL | +687 (535, 839) |
+942 (150, 1733) |
+1692 (749, 2635) |
+742 (592, 891) |
| 95% LoA’s | −3139, 4513 | −4280, 6164 | −2982, 6366 | −3235, 4718 |
N valid days, number of days which contained 24 h wear for both accelerometers; LoA, Limits of Agreement. Values are expressed as mean (95% CI) steps per day unless stated otherwise.