Table 3 [11C]PIB uptake RATIO in control subjects from three centres

	Anterior cingulated gyrus	Posterior cingulate gyrus	Thalamus	Striatum	Frontal cortex	Temporal cortex	Parietal cortex	Occipital cortex	Whole cortex
London
Mean	1.097	1.098	1.001	1.097	1.083	1.062	1.073	1.111	1.081
SD	0.088	0.081	0.075	0.052	0.057	0.037	0.047	0.045	0.039
Melbourne
Mean	1.258	1.246	1.102	1.112	1.173	1.117	1.107	1.16	1.145
SD	0.107	0.076	0.051	0.042	0.069	0.049	0.073	0.091	0.059
Turku
Mean	1.155	1.289	1.116	1.165	1.106	1.122	1.13	1.174	1.135
SD	0.076	0.102	0.053	0.039	0.046	0.068	0.079	0.076	0.057