Table 3. Whole-group correlation analyses using Spearman’s rho and considering the variables age, body mass index (BMI), proton density fat fraction (PDFF) of the erector spinae muscles of the segments L3–L5, T12–L2, and T9–T11, and PDFF of psoas muscles.

Variable	Value	Age	BMI	PDFF erector spinae muscles L3–L5	PDFF erector spinae muscles T12–L2	PDFF erector spinae muscles T9–T11	PDFF psoas muscles
Age	r	1.000	0.299	0.516	0.665	0.556	0.549
	P	–	0.009#	<0.001*	<0.001*	<0.001*	<0.001*
BMI	r	0.299	1.000	0.080	0.460	0.491	0.337
	P	0.009#	–	>0.05	<0.001*	<0.001*	0.003*
PDFF erector spinae muscles L3–L5	r	0.516	0.080	1.000	0.694	0.495	0.746
	P	<0.001*	>0.05	–	<0.001*	<0.001*	<0.001*
PDFF erector spinae muscles T12–L2	r	0.665	0.460	0.694	1.000	0.808	0.784
	P	<0.001*	<0.001*	<0.001*	–	<0.001*	<0.001*
PDFF erector spinae muscles T9–T11	r	0.556	0.491	0.495	0.808	1.000	0.643
	P	<0.001*	<0.001*	<0.001*	<0.001*	–	<0.001*
PDFF psoas muscles	r	0.549	0.337	0.746	0.784	0.643	1.000
	P	<0.001*	0.003*	<0.001*	<0.001*	<0.001*	–

*, statistically significant P values after Bonferroni correction for multiple testing (P<0.004). ^#, P values <0.05.