Table 4.

Models for predicting handgrip strength and muscle quality

Category	Model	Variables	Coefficient (B)	SE	P	R 2 adjusted
HGS (kg)	1					32.4%
		Agec *	−0.22	0.01	<0.001
		(Agec)2*	−0.005	0.001	<0.001
		Constant	25.66	0.28	<0.001
	2					33.6%
		Agec *	−0.22	0.01	<0.001
		(Agec)2*	−0.005	0.001	<0.001
		FMI	−0.16	0.05	0.001
		Constant	27.50	0.61	<0.001
	3					31.0%
		Agec *	−0.20	0.01	<0.001
		(Agec)2*	−0.005	0.001	<0.001
		ALMI	1.08	0.25	<0.001
		Constant	18.38	1.69	<0.001
	4					33.8%
		Agec *	−0.21	0.01	<0.001
		(Agec)2*	−0.005	0.001	<0.001
		FMI	−0.13	0.05	0.004
		ALMI	1.03	0.25	<0.001
		Constant	20.24	1.82	<0.001
MQ (kg/kg)	1					19.8%
		Agec *	−0.07	0.006	<0.001
		(Agec)2*	−0.002	0.0004	<0.001
		Constant	11.34	0.13	<0.001
	2					29.7%
		Agec *	−0.07	0.005	<0.001
		(Agec)2*	−0.002	0.0003	<0.001
		BMI	−0.15	0.02	<0.001
		Constant	15.74	0.44	<0.001

ALM, appendicular lean mass (kg); ALMI, appendicular lean mass index (kg/m²); BMI, body mass index (kg/m²); FMI, fat mass index (kg/m²); HGS, handgrip strength (kg); MQ, muscle quality (kg/kg).^*Age centred around mean age (56.5 years).