Age vs | MRI (*n* = 24) | *p*-value | CT (*n* = 16) | *p*-value |
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β coefficient | Adjusted R^{2} | β coefficient | Adjusted R^{2} |
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Changes of MF (cm^{3}) |

Right | −0.592 | 0.321 | 0.002^{a} | −0.076 | − 0.065 | 0.780 |

Left | − 0.489 | 0.204 | 0.015^{a} | 0.114 | −0.057 | 0.674 |

Changes of ES (cm^{3}) |

Right | 0.203 | −0.002 | 0.342 | −0.590 | 0.301 | 0.016^{a} |

Left | 0.267 | 0.029 | 0.207 | −0.281 | 0.013 | 0.292 |

Changes of Psoas (cm^{3}) |

Right | 0.184 | −0.010 | 0.388 | 0.019 | −0.071 | 0.945 |

Left | 0.155 | −0.020 | 0.469 | 0.189 | −0.033 | 0.482 |

*MRI* magnetic resonance imaging, *CT* computed tomography, *SD* standard deviation, *MF* multifidus, *ES* erector spinae^{a}Statistically significant difference was defined as *p* < 0.05