Table 4.

Correlation matrices of serum biomarkers vs. muscle mass or strength parameters

Correlation to muscle mass or strength at baselinea
	Young		Old		All
	m M, PRE	F M, PRE	m M, PRE	F M, PRE	m M, PRE	F M, PRE
C6MPRE	0.263	−0.012	0.321	0.040	−0.129	−0.230
IC6PRE	0.810**	0.151	0.108	0.007	0.507*	0.298
C6M/IC6 ratio	−0.378	−0.090	0.422	0.334	−0.382	−0.313

Correlation to muscle mass or strength at baseline: Correlation matrix showing correlation coefficients (R) for correlations between measured biomarker levels and muscle mass and strength at baseline for young and old subjects as well as pooled. m _M is muscle mass, F _M is muscle strength (MVC force)

*0.01 < p < 0.05; **p < 0.01