Ishii et al reported simple screening tools for sarcopenia in older Japanese adults. One model predicts the risk in males while a second predicts the risk in women. The authors are from multiple institutions in Japan.
Patient selection: male >= 65 years of age
Parameters:
(1) age in years
(2) grip strength in kg
(3) calf circumference in cm
|
Parameter |
Finding |
Points |
|
age in years |
65 |
0 |
|
|
66 |
2 |
|
|
68 |
4 |
|
|
70 |
6 |
|
|
72 |
8 |
|
|
74 |
10 |
|
|
76 |
12 |
|
|
78 |
14 |
|
|
80 |
16 |
|
|
82 |
18 |
|
|
84 |
20 |
|
|
>= 86 |
22 |
|
grip strength |
>= 34 kg |
0 |
|
|
32 |
10 |
|
|
30 |
20 |
|
|
28 |
30 |
|
|
26 |
40 |
|
|
24 |
50 |
|
|
22 |
60 |
|
|
20 |
70 |
|
|
18 |
80 |
|
|
16 |
90 |
|
|
14 |
100 |
|
|
< 14 |
110 |
|
calf circumference |
>= 42 cm |
0 |
|
|
40 |
7 |
|
|
38 |
14 |
|
|
36 |
21 |
|
|
34 |
28 |
|
|
32 |
35 |
|
|
30 |
42 |
|
|
28 |
49 |
|
|
26 |
56 |
|
|
< 26 |
63 |
total score =
= SUM(points for all of the paraemters)
Interpretation:
• minimum score: 0
• maximum score: 195
|
Total Score |
Probability of Sarcopenia |
|
< 80 |
< 1% |
|
80 |
1% |
|
90 |
3% |
|
95 |
5% |
|
100 |
8% |
|
105 |
12% |
|
110 |
19% |
|
115 |
28% |
|
120 |
39% |
|
125 |
51% |
|
130 |
63% |
|
135 |
74% |
|
140 |
82% |
|
145 |
88% |
|
150 |
93% |
Comparable Equation
score =
= (0.8 * ((age) - 64)) - (5.09 * ((grip strength) - 34)) - (3.28 * ((calf circumference) - 42))
value of X =
= (0.1 * (score)) - 12.5
probability of sarcopenia =
= 1 / (1 + EXP((-1) * X))
