Table 2.
Body composition according to three different definitions of LSMI.
| LSMI Defined by wSMI | LSMI Defined by hSMI | LSMI Defined by bSMI | |||||||
|---|---|---|---|---|---|---|---|---|---|
| No | Yes | p | No | Yes | p | No | Yes | p | |
| Men | |||||||||
| Unweighted number, n | 3106 | 121 | 2463 | 764 | 2851 | 376 | |||
| Appendicular skeletal muscle mass, kg | 22.3 ± 0.1 | 19.1 ± 0.4 | <0.001 | 23.3 ± 0.1 | 18.5 ± 0.1 | <0.001 | 22.6 ± 0.1 | 18.5 ± 0.2 | <0.001 |
| Appendicular fat mass, kg | 5.9 ± 0.0 | 8.9 ± 0.2 | <0.001 | 6.2 ± 0.0 | 5.2 ± 0.1 | <0.001 | 5.9 ± 0.0 | 6.7 ± 0.2 | <0.001 |
| Percentage of appendicular fat, % | 19.6 ± 0.2 | 30.3 ± 0.5 | <0.001 | 19.8 ± 0.2 | 20.7 ± 0.4 | 0.020 | 19.4 ± 0.2 | 25.0 ± 0.4 | <0.001 |
| Subtotal skeletal muscle mass, kg * | 46.9 ± 0.2 | 42.9 ± 1.0 | <0.001 | 48.7 ± 0.2 | 39.8 ± 0.2 | <0.001 | 47.4 ± 0.2 | 40.9 ± 0.4 | <0.001 |
| Subtotal fat mass, kg | 14.2 ± 0.1 | 22.8 ± 0.6 | <0.001 | 15.1 ± 0.2 | 12.5 ± 0.3 | <0.001 | 14.2 ± 0.2 | 17.4 ± 0.4 | <0.001 |
| Percentage of subtotal fat, % | 22.1 ± 0.2 | 33.6 ± 0.4 | <0.001 | 22.5 ± 0.2 | 22.6 ± 0.4 | 0.667 | 21.8 ± 0.2 | 28.6 ± 0.4 | <0.001 |
| Women | |||||||||
| Unweighted number, n | 4677 | 229 | 3518 | 1388 | 4397 | 509 | |||
| Appendicular skeletal muscle mass, kg | 14.5 ± 0.0 | 12.6 ± 0.3 | <0.001 | 15.1 ± 0.0 | 12.5 ± 0.1 | <0.001 | 14.6 ± 0.0 | 12.3 ± 0.1 | <0.001 |
| Appendicular fat mass, kg | 8.4 ± 0.0 | 11.4 ± 0.3 | <0.001 | 8.8 ± 0.0 | 7.9 ± 0.0 | <0.001 | 8.5 ± 0.0 | 9.4 ± 0.2 | <0.001 |
| Percentage of appendicular fat, % | 35.2 ± 0.1 | 45.4 ± 0.8 | <0.001 | 35.2 ± 0.1 | 36.8 ± 0.3 | <0.001 | 35.0 ± 0.1 | 41.3 ± 0.6 | <0.001 |
| Subtotal skeletal muscle mass, kg * | 32.5 ± 0.1 | 30.4 ± 0.6 | 0.001 | 33.8 ± 0.1 | 28.8 ± 0.1 | <0.001 | 32.8 ± 0.1 | 29.4 ± 0.3 | <0.001 |
| Subtotal fat mass, kg | 17.8 ± 0.1 | 26.2 ± 0.5 | <0.001 | 19.1 ± 0.1 | 15.8 ± 0.2 | <0.001 | 17.8 ± 0.1 | 22.0 ± 0.4 | <0.001 |
| Percentage of subtotal fat, % | 34.0 ± 0.1 | 45.0 ± 0.6 | <0.001 | 34.7 ± 0.2 | 34.0 ± 0.3 | 0.044 | 33.8 ± 0.1 | 41.5 ± 0.5 | <0.001 |
wSMI was defined as appendicular skeletal muscle mass divided by weight (%); hSMI index was defined as appendicular skeletal muscle mass divided by height square (kg/m2); bSMI was defined as appendicular skeletal muscle mass divided by body mass index (m2). * subtotal area includes whole body except the head area. Abbreviations: LSMI, low skeletal muscle mass index; wSMI, weight-adjusted skeletal muscle mass index; hSMI, height-adjusted skeletal muscle mass index; bSMI, body mass index-adjusted skeletal muscle mass index.