Table 4.
Agreement between MVPA steps derived by the activPAL and MVPA 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 MVPA steps | 4309 (4102, 4516) |
5214 (4092, 6336) |
2913 (2110, 3716) |
4306 (4104, 4508) |
| Verisense original algorithm (1) | ||||
| Verisense MVPA steps | 2085 (1979, 2192) |
2426 (1851, 3001) |
1893 (1345, 2442) |
2099 (1995, 2204) |
| Mean difference to activPAL | −2224 (−2074, −2374) |
−2788 (−2055, −3521) |
−1019 (−662, −1377) |
−2207 (−2062, −2351) |
| 95% LoA’s | −6010, +1562 | −7571, +1995 | −2791, +752 | −6055, +1641 |
| Verisense refined algorithm (2) | ||||
| Verisense MVPA steps | 3149 (2999, 3299) |
3935 (3065, 4805) |
2418 (1767, 3070) |
3098 (2954, 3243) |
| Mean difference to activPAL | −1160 (−1061, −1260) |
−1279 (−785, −1773) |
−494 (−186, −803) |
−1204 (−1101, −1307) |
| 95% LoA’s | −3684, +1363 | −4503, +1945 | −2022, +1033 | −3954, +1547 |
N valid days, number of days which contained 24 h wear for both accelerometers; LoA, Limits of Agreement; MVPA steps, moderate to vigorous steps (100 steps/min). Values are expressed as mean (95% CI) Moderate to vigorous steps per day unless stated otherwise.