Validation of Two Activity Monitors in Slow and Fast Walking Hospitalized Patients
Table 8
Relative and absolute reliability of steps, walking, and sedentary time assessed with ActivPAL3™, SENS motion®, and direct observations in older patients with hip fracture ().
Comparison
Mean (SD) of both assessments (sec)
Mean (SD) difference (sec)
value for difference
ICC2.1 (95% CI)
SEM (SEM%)
MDC95 (MDC%)
Steps
ActivPAL vs. observed
124.6 (83.7)
-95.8 (48.8)
<0.001
0.530 (-0.089-0.868)
57.4 (46)
159.1 (128)
SENS vs. observed
139.3 (83.4)
-66.3 (48.4)
0.001
0.660 (-0.081-0.910)
48.2 (35)
133.6 (96)
ActivPAL vs. SENS
91.4 (82.5)
-29.5 (44.4)
0.042
0.825 (0.431-9.949)
14.4 (16)
39.9 (44)
Walking time
ActivPAL vs. observed
140.3 (47.5)
-126.5 (78.5)
<0.001
0.062 (-0.097-0.375)
46.0 (33)
127.5 (91)
SENS vs. observed
184.5 (54.8)
-38.1 (36.8)
0.004
0.664 (-0.003-0.903)
31.8 (17)
88.1 (48)
ActivPAL vs. SENS
121.3 (51.5)
-88.4 (63.2)
0.001
0.223 (-0.121-0.632)
45.4 (37)
125.8 (103)
Sedentary time
ActivPAL vs. observed
196.5 (12.1)
1.1 (2.9)
0.2
0.970 (0.903-0.991)
2.1 (1)
5.8 (3)
SENS vs. observed
192.9 (11.3)
-6.0 (6.6)
0.010
0.756 0.157-0.932()
5.6 (3)
15.5 (8)
ActivPAL vs. SENS
193.5 (12.1)
7.0 (6.7)
0.004
0.716 (0.030-0.933)
6.4 (3)
17.7 (9)
ICC: intraclass correlation coefficient; SEM: standard error of measurement (); MDC: minimal detectable change (,). SEM and MDC indicate measurement error (in sec) at group and individual levels, respectively. ActivPAL: ActivPAL3™ monitor; SENS: SENS motion®.
