Validation of Two Activity Monitors in Slow and Fast Walking Hospitalized Patients
Table 7
Relative and absolute reliability of steps, walking, and sedentary time assessed with ActivPAL3™, SENS motion®, and direct observations in older medical patients ().
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
229.1 (45.8)
-43.6 (29.6)
<0.001
0.582 (-0.103-0.882)
29.6 (13)
82.0 (36)
SENS vs. observed
235.2 (41.1)
-31.5 (23.0)
0.001
0.678 (-0.076-0.916)
23.3 (10)
64.6 (27)
ActivPAL vs. SENS
213.4 (47.9)
-12.1 (24.8)
0.1
0.858 (0.579-0.957)
18.1 (8)
59.2 (24)
Walking time
ActivPAL vs. observed
160.0 (26.4)
-25.8 (16.3)
<0.001
0.582 (-0.102-0.884)
17.1 (11)
47.4 (30)
SENS vs. observed
165.8 (25.1)
-14.2 (9.0)
<0.001
0.816 (-0.038-0.960)
10.8 (7)
29.9 (18)
ActivPAL vs. SENS
152.9 (25.5)
-11.5 (12.7)
0.009
0.813 (0.243-0.950)
11.0 (7)
30.5 (20)
Sedentary time
ActivPAL vs. observed
184.8 (9.8)
-9.3 (10.7)
0.012
0.416 (-0.092-0.778)
7.5 (4)
20.8 (11)
SENS vs. observed
183.4 (9.2)
-12.0 (11.9)
0.005
0.264 (-0.141-0.671)
7.9 (4)
21.9 (12)
ActivPAL vs. SENS
178.8 (12.3)
2.8 (13.6)
0.5
0.544 (-0.015-0.844)
8.3 (5)
23.0 (13)
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®.
