BMI 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 | −0.371 | 0.098 | 0.075 | −0.004 | −0.071 | 0.987 |

Left | −0.214 | 0.002 | 0.315 | 0.293 | 0.021 | 0.271 |

Changes of ES (cm^{3}) |

Right | 0.184 | −0.010 | 0.391 | −0.128 | − 0.054 | 0.636 |

Left | 0.009 | −0.045 | 0.965 | −0.329 | 0.044 | 0.214 |

Changes of Psoas (cm^{3}) |

Right | −0.057 | −0.042 | 0.793 | −0.083 | − 0.064 | 0.759 |

Left | 0.107 | −0.034 | 0.619 | 0.178 | −0.038 | 0.511 |

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