Table 2. Univariate analysis of factors associated with skeletal muscle mass index (SMI) in male.

	All		Young-old (aged 60–74)		Old-old (aged 75≤)
	n = 152		n = 90		n = 62
Variables	r	p-value	r	p-value	r	p-value
Age	-0.363	<0.001	-0.228	0.031	-0.317	0.012
BMI	0.677	<0.001	0.752	<0.001	0.589	<0.001
BFP	0.033	0.685	0.203	0.055	-0.015	0.909
HbA1c	-0.180	0.026	-0.047	0.659	-0.453	<0.001
Total protein	-0.073	0.372	-0.171	0.107	0.057	0.662
Albumin	0.092	0.274	-0.094	0.383	0.224	0.100
T-bilirubin	0.088	0.280	-0.096	0.371	0.318	0.012
ID-bilirubin	0.133	0.111	-0.093	0.389	0.383	0.004
Hypertension	0.101	0.215	0.175	0.099	0.147	0.254
Hyperlipidemia	-0.105	0.200	-0.108	0.309	-0.087	0.504
CAD	-0.259	0.001	-0.097	0.365	-0.322	0.011
CVD	-0.062	0.449	-0.029	0.787	-0.008	0.950
Albuminuria	0.003	0.975	-0.057	0.605	0.153	0.240
Renal failure	0.079	0.333	-0.010	0.923	0.246	0.054
DDP4i	-0.006	0.940	-0.060	0.573	0.020	0.875
SGLT2i	0.140	0.085	0.148	0.165	-0.031	0.814
SU	-0.144	0.076	0.009	0.936	-0.278	0.029
Metformin	0.108	0.187	0.130	0.222	-0.036	0.783
GLP-1RA	-0.106	0.194	-0.038	0.721	-0.180	0.161
Insulin	-0.103	0.206	-0.120	0.259	-0.027	0.836

Spearman rank correlation test was performed to evaluate the correlation between skeletal muscle mass index

(SMI) and various variables.

Number of patients with missing data: Albumin, all n = 8, young-old n = 1, old-old n = 7; ID-Bil, all n = 8, young-old n = 1, old-old n = 7; Albuminuria, all n = 5, young-old n = 4, old-old n = 1.

Abbreviation: BMI, body mass index; SMI, skeletal muscle mass index; BFP, body fat percent; HbA1c, hemoglobin A1c; T-bilirubin, total bilirubin; ID-bilirubin, indirect bilirubin; CAD, cardiovascular disease; CVD, cerebrovascular disease; DPP4i, dipeptidyl peptidase-4 inhibitor; SGLT2i, sodium glucose co transporter-2 inhibitor; SU, sulfonylurea; GLP1-RA, glucagon-like peptide-1 receptor agonists.