Table 8.
Characteristics of the external validation cohort.
| Men | Women | P value | |||
|---|---|---|---|---|---|
| n=135 | n=232 | ||||
| Age, years | 78.0 | ±6.4 | 76.8 | ±7.4 | 0.117 |
| Body height, cm | 162.3 | ±6.2 | 149.3 | ±6.5 | <0.001 |
| Body weight, kg | 60.8 | ±10.0 | 51.5 | ±10.1 | <0.001 |
| BMI, kg/m2 | 23.1 | ±3.4 | 23.1 | ±4.2 | 0.977 |
| Sarcopenia diagnosis | |||||
| Low muscle mass, n(%) | 87 | (64.4) | 69 | (29.7) | <0.001 |
| Low muscle function, n(%) | 65 | (48.1) | 118 | (50.9) | 0.665 |
| Sarcopenia, n(%) | 44 | (32.6) | 43 | (18.5) | 0.003 |
| Quantity | |||||
| CSA, cm2 | 48.0 | ±9.7 | 36.2 | ±6.9 | <0.001 |
| CSA / Height, cm | 0.295 | ±0.056 | 0.242 | ±0.043 | <0.001 |
| CSA / Height2, % | 0.182 | ±0.034 | 0.162 | ±0.029 | <0.001 |
| CSA / Weight, cm2/kg | 0.791 | ±0.115 | 0.713 | ±0.127 | <0.001 |
| CSA / BMI, 104·cm4/kg | 2.09 | ±0.34 | 1.59 | ±0.32 | <0.001 |
| ASM, kg | 17.7 | ±2.7 | 13.1 | ±2.3 | <0.001 |
| SMI, kg / m2 | 6.70 | ±0.84 | 5.88 | ±0.91 | <0.001 |
| ASM / Weight, % | 29.3 | ±2.6 | 25.7 | ±2.6 | <0.001 |
| ASM / BMI, m2 | 0.77 | ±0.10 | 0.58 | ±0.08 | <0.001 |
| Quality | |||||
| CTV, HU | 46.8 | ±5.6 | 43.5 | ±5.7 | <0.001 |
| CTV / BMI, HU·m2/kg | 2.08 | ±0.41 | 1.96 | ±0.46 | 0.01 |
| KES / CSA, N/cm2 | 5.41 | ±1.49 | 4.87 | ±1.34 | <0.001 |
| Quality×Quantity | |||||
| CSA × CTV, cm2·HU | 2266 | ±606 | 1587 | ±421 | <0.001 |
| CSA × CTV / Height, cm·HU | 13.9 | ±3.5 | 10.6 | ±2.7 | <0.001 |
| CSA × CTV / Height2, HU | 0.086 | ±0.021 | 0.071 | ±0.017 | <0.001 |
| CSA × CTV / Weight, cm2·HU/kg | 37.4 | ±8.5 | 31.4 | ±8.3 | <0.001 |
| CSA × CTV / BMI, 104·cm4·HU/kg | 99 | ±25 | 70 | ±20 | <0.001 |
| Physical performance | |||||
| Grip, kg | 30.0 | ±6.9 | 20.9 | ±5.3 | <0.001 |
| KES, N | 259 | ±88 | 176 | ±60 | <0.001 |
Values are expressed as number (%).
Mean ± standard deviation.
Mean ± standard deviation.
P values were obtained using the t-test for continuous data and the χ2 test and fisher's exact test for categorical data.
Abbreviations: BMI, body mass index; CSA, cross-sectional area; ASM, appendicular skeletal muscle mass; SMI, skeletal muscle mass index; CTV, computed tomography attenuation value; HU, Hounsfield unit; KES, knee extension strength.