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Correlations between age and the BPNDs of [11C]-Raclopride. Correlation analyses were performed to determine the association between age and BPND with each radiotracer in each region of interest (ROI). Negative correlations were found between age and [11C]-Raclopride binding in the caudate, putamen, and ventral striatum (r(68)=−0.50, P<0.001; r(68)=−0.41, P<0.001; r(68)=−0.43, P<0.001, respectively). BPND, nondisplaceable binding potential.
