Table 2:

Bivariate Pearson correlation coefficients between MRI measures and multivariable linear regression of R2* with QSM and R2 using zero intercept (R2* = a1QSM + a2R2)

	GP	Putamen	Caudate	Aput	Pput
MRI
R2 (QSM)	0.51^{^a}	0.72^{^b}	0.52^{^a}	0.67^{^a}	0.72^{^a}
R2* (QSM)	0.73^{^b}	0.81^{^b}	0.47^{^a}	0.71^{^a}	0.83^{^a}
R2* (R2)	0.55^{^b}	0.78^{^b}	0.48^{^a}	0.75^{^a}	0.75^{^a}
CSF-T2WI (T2)	0.71^{^b}	0.85^{^b}	0.59^{^b}	0.79^{^b}	0.87^{^b}
Multivariable linear regression for R2*
a₁	0.28 ± 0.04^{^b}	0.22 ± 0.04^{^b}	0.15 ± 0.06^{^c}	0.21 ± 0.05^{^a}	0.25 ± 0.04^{^b}
a₂	1.05 ± 0.14^{^b}	1.31 ± 0.07^{^b}	1.42 ± 0.16^{^b}	1.42 ± 0.08^{^b}	1.08 ± 0.10^{^b}
Fractional	QSM: 47%	QSM: 23%	QSM: 20.0%	QSM: 18%	QSM: 36%
Contributions	R2: 53%	R2: 77%	R2: 80.0%	R2: 82%	R2: 64%

Note:—Aput indicates cognitive anterior part of putamen, region predominantly connected to frontal cortex; Pput, motor posterior part of putamen, region predominantly connected to sensorimotor cortex.
↵a P < 10⁻³.
↵b P < 10⁻⁶.
↵c P = .02.