Table 6.

Concordance statistic (C-statistic) from conditional logistic regression models and comparison of predictive accuracy between cases and controls by method of defining subtle cognitive decline. P-values computed using jack-knifed variance estimates.

		Comparing concordances (p values)
	Concordance (p value)	sOBJ at 30 months	WSD	LR	LME
sOBJ
baseline	0.59 (0.003)	0.12	0.38	0.21	0.09
30 months	0.69 (<0.001)	--	0.004	<0.001	0.95
ΔOBJ
WSD	0.50 (0.21)	--	--	0.33	0.02
LR	0.46 (0.58)	--	--	--	0.004
LME	0.69 (<0.001)	--	--	--	--

Note. sOBJ = subtle objective cognitive impairment (cross-sectional). ΔOBJ = subtle objective cognitive decline (longitudinal). WSD = within subjects’ standard deviation. LR = annualized change from linear regression model. LME = annualized change from linear mixed effects model.