Table 2. Global and regional distribution volume ratios (DVRs).

DVR	Whole sample	Lower tertile*	Middle tertile	Upper tertile*
N	N=55	N=18	N=19	N=18
Mean cortical DVR	1.17(0.26)	0.93(0.02)	1.08(0.09)	1.49(0.16)
Orbitofrontal gyrus	1.09(0.27)	0.86(0.04)	0.1(0.14)	1.40(0.19)
Prefrontal gyrus	1.11(0.29)	0.86(0.04)	1.02(0.13)	1.46(0.19)
Superior frontal gyrus	1.20(0.34)	0.90(0.04)	1.08(0.14)	1.61(0.22)
Parietal lobe	1.14(0.24)	0.92(0.05)	1.07(0.08)	1.42(0.19)
Medial temporal gyrus	1.01(0.09)	0.95(0.07)	1.01(0.06)	1.06(0.11)
Lateral temporal gyrus	1.13(0.24)	0.93(0.03)	1.05(0.12)	1.41(0.19)
Occipital gyrus	1.08(0.13)	0.99(0.06)	1.06(0.07)	1.19(0.15)
Anterior cingulate gyrus	1.27(0.34)	0.97(0.07)	1.17(0.18)	1.67(0.23)
Posterior cingulate gyrus	1.32(0.35)	1.02(0.06)	1.19(0.1)	1.76(0.23)

Data are presented as mean (SD) distribution volume ratio.

^*All DVR measures are significantly higher in the upper tertile than the lower tertile (p<0.005). Data in bold indicate greater than DVR positivity cut-off of 1.062 for cDVR, indicating more than minimal Aβ.