Table 2 Comparison of the female and male groups classified based on fat infiltration of the posterior paraspinal muscles (PPM)
| Â | Muscle Measurements | ||||
|---|---|---|---|---|---|
|  |  < 50% FIPPM |  ≥ 50% FIPPM | p-value | ||
Females | Psoas | CSA [cm2/m2] | 6.6 [5.6;8.1] | 6.7 [6.1;7.8] | 0.801 |
fCSA [cm2/m2] | 6.0 [5.2;7.3] | 6.3 [5.7;7.7] | 0.348 | ||
FAT [cm2/m2] | 0.36 [0.16;0.71] | 0.23 [0.10;0.43] | 0.016 | ||
FI [%] | 5.6 [2.6;9.7] | 3.2 [1.3;6.4] | 0.009 | ||
PPM | CSA [cm2/m2] | 18.2 [16.2;20.2] | 19.9 [17.8;23.6] | 0.002 | |
fCSA [cm2/m2] | 11.0 [9.2;12.3] | 8.6 [7.4;10.2] |  < 0.001 | ||
FAT [cm2/m2] | 7.5 [6.2;8.6] | 11.4 [9.9;13.5] |  < 0.001 | ||
FI [%] | 40.9 [35.1;46.9] | 55.5 [53.4;59.2] |  < 0.001 | ||
Males | Psoas | CSA [cm2/m2] | 9.4 [7.8;11.3] | 10.0 [8.1;11.2] | 0.685 |
fCSA [cm2/m2] | 8.6 [7.4:10.2] | 9.6 [8.0;11.0] | 0.311 | ||
FAT [cm2/m2] | 0.37 [0.21;0.65] | 0.33 [0.10;0.38] | 0.068 | ||
FI [%] | 3.7 [2.2;7.8] | 3.0 [1.0;3.8] | 0.034 | ||
PPM | CSA [cm2/m2] | 19.5 [17.2;23.0] | 17.7 [16.9;19.2] | 0.083 | |
fCSA [cm2/m2] | 12.0 [10.8;14.1] | 8.1 [7.1;8.8] |  < 0.001 | ||
FAT [cm2/m2] | 7.4 [5.8;9.3] | 10.3 [9.3;11.0] |  < 0.001 | ||
FI [%] | 38.9 [32.7;44.0] | 54.6 [53.1;60.0] |  < 0.001 | ||