Fat infiltration of the posterior paraspinal muscles is inversely associated with the fat infiltration of the psoas muscle: a potential compensatory mechanism in the lumbar spine

Table 3 Correlation analysis for the muscular parameters stratified for sex

			Posterior Paraspinal Muscles (PPM)
			Female				Male
			CSA [cm²/m²]	fCSA [cm²/m²]	FAT [cm²/m²]	FI [%]	CSA [cm²/m²]	fCSA [cm²/m²]	FAT [cm²/m²]	FI [%]
Psoas	Female	CSA [cm²/m²]	,337^**	,366^**	,136	-,076
		fCSA [cm²/m²]	,380^**	,307^**	,230^*	,022
		FAT [cm²/m²]	-,076	,299^**	-,316^**	-,392^**
		FI [%]	-,177	,222^*	-,383^**	-,403^**
	Male	CSA [cm²/m²]					,370^**	,350^**	,239^*	-,043
		fCSA [cm²/m²]					,434^**	,325^**	,380^**	,091
		FAT [cm²/m²]					-,117	,160	-,444^**	-,427^**
		FI [%]					-,255^*	,058	-,558^**	-,452^**

Significant values are marked with * or **. ρ -values marked with * are significant at the 0.05 level. ρ -values marked with ** are significant at the 0.01 level. CSA Cross sectional area, fCSA Functional cross-sectional area, FAT Total fat area, FI fat infiltration

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