Table 2.

Summary of hazard ratios from Cox proportional hazard models within all 218 subjects with mild cognitive impairment

	Hazard ratio (95% CI)	P
Hippocampal volumea		<0.001
25th versus 50th percentile (i.e. 5.6 versus 1.6)	1.6 (1.3, 1.8)
50th versus 75th percentile (i.e. 6.3 versus 7.1)	1.7 (1.2, 2.2)
25th versus 75th percentile (i.e. 5.6 versus 7.1)	2.6 (1.8, 3.8)
Aβ load		<0.001
50th versus 25th percentile (i.e. 2.0 versus 1.5)	2.3 (1.4, 3.8)
75th versus 50th percentile (i.e. 2.3 versus 2.0)	1.1 (0.9, 1.4)
75th versus 25th percentile (i.e. 2.3 versus 1.5)	2.6 (1.5, 4.5)

a Hippocampal volume model also includes total intercranial volumes as a covariate.