Table 4 SMI and PMI by sex and age
|  | Male (n = 61) | Female (n = 38) | P value |
|---|---|---|---|
(A) SMI and PMI by sex | |||
 Grip strength (kg) | 30.9 (14.2–43.5) | 17.6 (7.2–25.2) |  < 0.001 |
 Skeletal muscle area (cm2) | 131.90 (86.99–188.46) | 98.32 (72.12–143.99) |  < 0.001 |
 Skeletal muscle index (cm2/m2) | 51.0 (29.4–68.5) | 45.1 (32.5–65.0) | 0.001 |
 Psoas muscle area (cm2) | 14.88 (6.46–24.49) | 8.89 (5.11–15.79) |  < 0.001 |
 Psoas muscle index (cm2/m2) | 5.6 (3.1–9.2) | 4.0 (2.5–7.6) |  < 0.001 |
|  |  < 80 years (n = 84) |  ≥ 80 years (n = 15) | P value |
|---|---|---|---|
(B) SMI and PMI by age | |||
 Grip strength (kg) | 26.8 (8.9–43.5) | 17.0 (7.2–28.3) |  < 0.001 |
 Skeletal muscle area (cm2) | 122.01 (72.12–188.46) | 99.59 (72.31–173.66) | 0.023 |
 Skeletal muscle index (cm2/m2) | 47.9 (29.4–68.5) | 47.3 (32.5–66.7) | 0.507 |
 Psoas muscle area (cm2) | 13.19 (5.11–24.49) | 9.00 (5.33–23.29) | 0.028 |
 Psoas muscle index (cm2/m2) | 5.2 (2.5–9.2) | 4.1 (2.5–8.9) | 0.212 |