Table 4.
Mixed effect regression models and resultant inactivity and MVPA intensity thresholds for SVM and MAD
| Coefficient (95% CI) | Constant (95%CI) | Inactivity Threshold (< 1.5 METs) (mg) (95% CI)† | MVPA Threshold (≥3.0 METs) (mg) (95% CI)† | |
|---|---|---|---|---|
| SVM | ||||
| Right wrist | ||||
| All patients (n = 21, obs = 168) | 17.9 (15.4 to 20.5)*** | −8.3 (−14.2 to −2.3)** | 18.6 (8.8 to 28.4) | 45.5 (31.9 to 59.1) |
| Excluded aided walking activity data‡ (n = 21, obs = 159) | 20.2 (17.6 to 22.9)*** | −11.7 (− 17.6 to −5.9)*** | 18.6 (8.7 to 28.5) | 49.0 (35.1 to 62.9) |
| Excluded aided walking activity data and washing up activity data §(n = 21, obs = 138) | 19.8 (17.7 to 22.0)*** | −16.4 (− 19.9 to − 13.0)*** | 13.3 (6.7 to 19.9) | 43.1 (33.3 to 52.9) |
| Left wrist | ||||
| All patients (n = 20, obs = 160) | 18.0 (15.5 to 20.5)*** | −10.3 (− 15.4 to −5.2)*** | 16.7 (7.8 to 25.6) | 43.6 (38.5 to 56.3) |
| Excluded aided walking activity data‡ (n = 20, obs = 151) | 20.1 (17.7 to 22.5)*** | −13.2 (− 18.2 to −8.2)*** | 16.9 (8.3 to 25.5) | 47.0 (34.8 to 59.2) |
| Excluded aided walking activity data and washing up activity data § (n = 20, obs = 131) | 19.9 (17.6 to 22.2)*** | −15.5 (− 19.6 to − 11.5)*** | 14.4 (6.8 to 21.85) | 44.3 (33.2to 55.2) |
| Waist | ||||
| All patients (n = 21, obs = 168) | 22.0 (18.3 to 25.7)*** | −25.4 (−30.5 to − 20.2)*** | 7.6 (−3.1 to 18.4) | 40.6 (24.3 to 57.0) |
| Excluded aided walking activity data‡ (n = 20, obs = 159) | 22.9 (19.6 to 26.2)*** | −26.6 (−31.7 to − 21.5)*** | 7.7 (− 2.3 to 17.8) | 42.0 (27.1 to 57.0) |
| Excluded aided walking activity data and washing up activity data § (n = 21, obs = 138) | 24.0 (20.2 to 27.9)*** | −24.9 (− 29.5 to − 20.4)*** | 11.1 (0.78 to 21.49) | 47.2 (31.0 to 63.32) |
| MAD | ||||
| Right wrist | ||||
| All patients (n = 21, obs = 168) | 5.3 (2.5 to 8.0)*** | 10.4 (3.1 to 17.8)** | 18.3 (6.9 to 29.7) | 26.2 (10.7 to 41.7) |
| Excluded aided walking activity data‡ (n = 21, obs = 159) | 7.4 (4.5 to 10.3)*** | 7.3 (−0.1 to 14.6) | 18.4 (6.6 to 30.1) | 29.5 (13.4 to 45.6) |
| Excluded aided walking activity data and washing up activity data § (n = 21, obs = 138) | 7.0 (4.2 to 9.8)*** | 3.7 (−2.6 to 10.0) | 14.2 (3.6 to 24.8) | 24.7 (9.9 to 39.5) |
| Left wrist | ||||
| All patients (n = 20, obs = 160) | 2.8 (0.3 to 5.2)* | 14.6 (7.5 to 21.7)*** | 18.7 (7.9 to 29.5) | 22.8 (8.3 to 37.3) |
| Excluded aided walking activity data‡ (n = 20, obs = 151) | 3.7 (1.0 to 6.3)** | 13.3 (6.1 to 20.5)*** | 18.8 (7.6 to 29.9) | 24.2 (9.1 to 39.4) |
| Excluded aided walking activity data and washing up activity data § (n = 20, obs = 131) | 3.5 (0.8 to 6.2)* | 10.1 (3.2 to 17.0)** | 15.4 (4.4 to 26.3) | 20.7 (5.7 to 35.6) |
| Waist | ||||
| All patients (n = 21, obs = 168) | 0.9 (0.7 to 1.2)*** | −0.5 (−0.9 to 0.0) | 1.0 (0.2 to 1.7) | 2.4 (1.3 to 3.5) |
| Excluded aided walking activity data‡ (n = 21, obs = 159) | 1.0 (0.8 to 1.2)*** | −0.6 (−1.1 to − 0.1)* | 1.0 (0.2 to 1.8) | 2.5 (1.4 to 3.6) |
| Excluded aided walking activity data and washing up activity data § (n = 21, obs = 138) | 1.1 (0.8 to 1.3)*** | −0.6 (−1.0 to − 0.2)** | 1.0 (0.3 to 1.7) | 2.6 (1.5 to 3.6) |
MVPA moderate-to-vigorous physical activity, SVM sum of vector magnitudes, MAD mean amplitude deviation, METS metabolic equivalents
†95% CI calculated using upper and lower bounds of coefficient and constant in formula.
* p < 0.05, ** p < 0.01, *** p < 0.001
‡ Excluded walking activity data for n = 3 patients using walking aids.
§ Excluded walking activity data for n = 3 patients using walking aids and all washing up activity data