Table 2.

Correlations between the SMI, phase angle, anterior thigh muscle thickness, and clinical variables.

Variable	Males (n = 277) SMI r-Value (p-Value)	Phase Angle r-Value (p-Value)	MTH r-Value (p-Value)	Females (n = 135) SMI r-Value (p-Value)	Phase Angle r-Value (p-Value)	MTH r-Value (p-Value)
Age	−0.3387 ****	−0.3120 ****	−0.3681 ****	−0.4590 ****	−0.3230 ****	−0.3900 ****
BMI	0.7290 ****	0.3310 ****	0.5768 ****	0.6076 ****	0.3115 ***	0.4840 ****
Hand grip	0.5948 ****	0.6713 ****	0.5542 ****	0.5551 ****	0.5989 ****	0.4726 ****
Knee extension MVC	0.5523 ****	0.6053 ****	0.5968 ****	0.4818 ****	0.5260 ****	0.4344 ****
CONUT	−0.2088 *	−0.4190 ****	−0.2753 ***	−0.0715	−0.2198	−0.2687 *
Hb	0.2385 ***	0.4668 ****	0.4067 ****	0.1343	0.2066 *	0.1071
Alb	0.1424 *	0.4055 ****	0.2467 ****	0.1509	0.3115 ***	0.4840 **
eGFR	0.1679 **	0.4183 ****	0.2360 ***	0.0671	0.2549 **	0.1167
BNP	−0.2397 **	−0.3527 ****	−0.3858 ****	−0.1992	−0.3268 **	−0.1849
SMI	–	0.4944 ****	0.6620 ****	–	0.4438 ****	0.5958 ***
Phase angle	0.4944 ****	–	0.6683 ****	0.4438 ****	–	0.5942 ****
MTH	0.6620 ****	0.6683 ****	–	0.5958 ****	0.5942 ****	–
SPPB (total)	0.2088 *	0.4293 ****	0.3197 ****	0.3826 ****	0.5325 ****	0.3237 ***
Balance	0.1457 *	0.2553 ****	0.0910	0.4017 ****	0.3977 ****	0.2559 **
Gait speed	0.2402 ***	0.4112 ****	0.3070 ****	0.1404	0.0764	0.2932 **
Chair stand	−0.2403 ***	−0.4666 ****	−0.3840 ****	−0.2773 ***	−0.3652 ****	−0.3376 ***

**** p < 0.0001, *** p < 0.001, ** p < 0.01, * p < 0.05. BMI, body mass index; CONUT score, controlling nutritional status score; Hb, hemoglobin; Alb, albumin; eGFR, estimated glomerular filtration rate; BNP, brain natriuretic peptide; SMI, skeletal muscle mass index; MTH, anterior thigh muscle thickness; SPPB, short physical performance battery.