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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.