Table 3. Summary of mean values and standard deviations (SD) of the susceptibility of BG ROIs for the young (N=8) and old (N=8) macaques.

Susceptibility (ppm)	Left hemisphere				Right hemisphere				Between hemispheres
	Young (mean ± SD)	Old (mean ± SD)	P value		Young (mean ± SD)	Old (mean ± SD)	P value		Young (P value)	Old (P value)
GP	0.024±0.017	0.107±0.070	0.012		0.029±0.015	0.101±0.074	0.029		0.093	0.296
PU	0.003±0.007	0.024±0.011	<0.001		0.002±0.006	0.024±0.019	0.016		0.670	0.952
CN	−0.005±0.006	0.009±0.011	0.011		−0.0078±0.004	0.013±0.011	0.001		0.199	0.215

BG, basal ganglia; GP, globus pallidus; PU, putamen; CN, caudate nucleus.