Validation of Two Activity Monitors in Slow and Fast Walking Hospitalized Patients
Table 5
Relative and absolute reliability of steps, assessed with ActivPAL3™, SENS motion®, and direct observations.
Comparison
Mean (SD) of both assessments (steps)
Mean (SD) difference (steps)
value for difference
ICC2.1 (95% CI)
SEM (SEM%)
MDC95 (MDC%)
ActivPAL vs. observed
All,
183.3 (82.2)
-75.5 (49.1)
<0.001
0.609 (-0.086-0.865)
51.4 (28)
142.5 (78)
Slow walkers,
137.4 (71.2)
-94.1 (50.9)
<0.001
0.439 (-0.095-0.791)
53.3 (39)
147.7 (107)
Fast walkers,
252.3 (40.0)
-47.5 (30.5)
<0.001
0.468 (-0.110-0.820)
29.2 (12)
80.9 (32)
SENS vs. observed
All,
193.4 (78.6)
-55.3 (39.3)
<0.001
0.717 (-0.043-0.909)
41.8 (22)
115.9 (60)
Slow walkers,
151.5 (70.1)
-65.9 (42.5)
<0.001
0.596 (-0.093-0.870)
44.6 (29)
123.6 (82)
Fast walkers,
256.3 (38.3)
-39.5 (28.4)
<0.001
0.523 (-0.106-0.845)
26.5 (10)
73.5 (29)
ActivPAL vs. SENS
All,
155.7 (88.5)
-20.1 (34.8)
0.002
0.905 (0.758-0.957)
27.3 (18)
75.7 (49)
Slow walkers,
104.4 (73.4)
-28.3 (41.4)
0.005
0.803 (0.451-0.925)
32.6 (31)
90.4 (89)
Fast walkers,
232.6 (40.0)
-8.0 (16.5)
0.1
0.906 (0.723-0.969)
12.3 (5)
34.1 (15)
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. Slow walkers: <0.67 m/s; fast walkers: ≥0.67 m/s. ActivPAL: ActivPAL3™ monitor; SENS: SENS motion®.
