Table 3.

Comparison of percentages of participants (NC–NC^a, NC–AD^b) situated in the dark gray area in Fig. 2 (at baseline)

	% in the dark gray areac		p valued	ORe (95 % CIf)
	NC–NCa (%)	NC–ADb (%)
25th percentile	7.7	34.6	0.04*	6.35 (1.22, 33.19)
16th percentile	0	23.1	0.02*	16.8 (0.90, 315.89)
10th percentile	3.8	23.1	0.10	7.5 (0.83, 67.49)
7th percentile	11.5	23.1	0.47	2.3 (0.51, 10.41)
2.5th percentile	3.8	11.5	0.61	3.3 (0.32, 33.62)
1st percentile	3.8	15.4	0.35	4.6 (0.47, 43.78)

* p value < 0.05

^aNC–NC = cognitively healthy participants who remained healthy

^bNC–AD = initially healthy participants who progressed to Alzheimer’s disease dementia

^cDark gray area = to be considered as a pathological result (see Fig. 2)

^dFisher’s p value tested by Fisher’s exact test

^e OR odds ratio

^f CI confidence interval