TABLE 2

PET Findings in Controls, MCI, and AD at Each Time Point

	Month
Diagnosis	0	6	12	24
Control
n	44	48	48	49
MMSE	29.1 ± 0.88	29.1 ± 0.78	29.2 ± 1.22	29.1 ± 1.01
ADAS-cog	7.4 ± 3.1	6.6 ± 3.1	6.1 ± 3.0	5.7 ± 3.2
PET score	0.64 ± 0.37	0.63 ± 0.37	0.67 ± 0.36	0.67 ± 0.36
% PET abnormal	11	17	21	16
MCI
n	94	88	79	59
MMSE	27.1 ± 1.58	26.8 ± 2.52	26.9 ± 2.35	27.1 ± 2.56
ADAS-cog	10.6 ± 4.0	11.5 ± 4.6	11.7 ± 5.1	11.9 ± 5.1
PET score	1.01 ± 0.62	1.08 ± 0.67	1.13 ± 0.70	1.07 ± 0.65
% PET abnormal	40	47	49	44
AD
n	40	42	51	70
MMSE	23.4 ± 1.95	22.8 ± 3.33	21.8 ± 3.92	21.3 ± 4.49
ADAS-cog	18.8 ± 5.91	19.5 ± 5.60	20.8 ± 8.33	22.2 ± 10.18
PET score	1.74 ± 0.79	1.85 ± 0.83	1.84 ± 0.81	2.05 ± 0.88
% PET abnormal	85	86	85	86

Data are mean ± SD.