Tanaka et al reported several decision tree models for identifying the severity of the locomotive syndrome in an older adult. The authors are from Kanagawa University, Hiroshima University, and System Friend, Inc.
Locomotive syndrome ranged from Grade 0 (non-severe) to 3 (most severe).
Patient selection: age >= 65 years
Examinations:
(1) single leg standing test in seconds
(2) grip strength in kilograms
(3) timed up and go test (TUG) in seconds
(4) maximum walking time in seconds (along a 5-meter path at maximum speed)
(5) maximum walking time in seconds (along a 5-meter path at preferred speed)
Model 1
Single Leg Standing
Grip Strength
Locomotive Syndrome
>= Stage 1
<= 59.4
NA
91%
> 59.4
<= 37.8
71%
> 59.4
> 37.8
20%
Model 2
Single Leg Standing
Time Up and Go
Locomotive Syndrome
>= Stage 2
<= 12.6
<= 7.9
27%
<= 12.6
> 7.9
88%
12.7 to 55.3
NA
17%
> 55.3
NA
8%
Model 3
Predictive Value Model 2
Maximum Walking Time
Locomotive Syndrome
Stage 3
0
NA
5%
1
<= 3.75
14%
1
> 3.75
60%
Model 1 Using Walking Times
Single Leg Standing
Maximum Walking Speed
Preferred Walking Speed
Locomotive Syndrome
<= 56.3
<= 3.25
NA
72%
<= 56.3
> 3.25
NA
92%
> 56.3
NA
<= 2.95
80%
> 56.3
NA
> 2.95
34%
Additional decision tree models are shown in Figures 5 to 11.
Model 2 had an area under the ROC curve of 0.76.
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