Figure 1Body position for the measurement of knee height in clinical validation group (A, healthy elderly group; B, mobility-impaired group). In both groups, knee height was measured using a flexible tape while the knee and ankle joints were flexed at 90°. (A) It was measured in the sitting position with a tape attached to the wall, and was defined as the distance between the floor and suprapatella point. This method is identical to the one used in 'Size Korea 2004'. (B) In recumbent position, the measured distance is between landing point and suprapatella point from lateral side.
Table 1General characteristics of subjects
Variables |
‘SIZE KOREA 2004’*
|
p†
|
Clinical-validation‡
|
Training
|
Cross validation
|
Elderly
|
Mobility impaired
|
Male |
Female
|
Male |
Female
|
Male |
Female |
Male |
Female |
preM |
postM |
preM |
postM |
|
|
|
|
Number (n) |
2,020 |
1,425 |
596 |
512 |
360 |
150 |
|
7 |
26 |
25 |
14 |
Age (yr) |
40.8 ±14.2 |
33.0±7.9 |
59.0±5.5 |
40.6 ±14.1 |
32.9±7.9 |
59.2 ±5.4 |
0.8128 |
66.0±3.0 |
67.5±4.0 |
59.0 ±21.0 |
72.5 ±14.0 |
|
|
|
|
|
|
|
0.9698 |
|
|
|
|
|
|
|
|
|
|
|
0.6750 |
|
|
|
|
Height (cm) |
169.3±6.4 |
158.0 ±5.1 |
152.9±5.2 |
169.6 ±6.2 |
158.3±5.4 |
153.3 ±5.1 |
0.2500 |
163.4±2.8 |
151.4±6.6 |
170.0 ±5.0 |
153.1 ±12.0 |
|
|
|
|
|
|
|
0.2012 |
|
|
|
|
|
|
|
|
|
|
|
0.3920 |
|
|
|
|
Knee height (cm) |
50.5±2.5 |
47.4 ±2.0 |
46.0±2.1 |
50.6±2.4 |
47.5±2.2 |
46.2±1.9 |
0.1328 |
48.9±1.7 |
45.7 ±2.8 |
50.7±4.7 |
46.1 ±3.5 |
|
|
|
|
|
|
|
0.2473 |
|
|
|
|
|
|
|
|
|
|
|
0.2732 |
|
|
|
|
Table 2Equations for predicting stature and cross-validation
Stature-predicted equation (cm) |
Training*
|
Cross-validation
|
R2
|
RMSE |
p
|
Mean±SD |
Mean difference±SD |
p†
|
ICC‡ (95% CI) |
Male |
(n=2,020) |
|
|
(n=512) |
|
|
|
74.63- (0.09 age)+ (1.95 knee height) |
0.73 |
3.32 |
<0.0001 |
169.6 ±5.4 |
0.01 ±2.95 |
0.9340 |
0.93 (0.92-0.94) |
Premenopausal female |
(n=1,425) |
|
|
(n=360) |
|
|
|
66.13- (0.07 age)+ (1.99 knee height) |
0.68 |
2.90 |
<0.0001 |
158.2 ±4.4 |
0.11 ±2.72 |
0.4466 |
0.92 (0.90-0.93) |
Postmenopausal female |
(n=596) |
|
|
(n=150) |
|
|
|
70.87- (0.14 age)+ (1.96 knee height) |
0.69 |
2.88 |
<0.0001 |
153.3 ±4.1 |
-0.03 ±3.06 |
0.9136 |
0.88 (0.83-0.91) |
Table 3Clinical-validation in the elderly and mobility-impaired groups
Estimated height (cm) |
Healthy elderly
|
p |
Mobility-impaired
|
p |
n |
Mea±SD |
Median difference±IQR |
n |
Mea±SD |
Median difference ±IQR |
Male |
7 |
163.7±2.9 |
0.65±4.65 |
0.9375 |
25 |
169.4±6.6 |
-0.23±5.45 |
0.9065 |
Female |
26 |
152.0 ±3.9 |
-0.10±3.65 |
0.8532 |
14 |
151.8 ±5.4 |
1.64 ±5.36 |
0.2412 |