. Author manuscript; available in PMC: 2010 Aug 16.

Published in final edited form as: J Int Neuropsychol Soc. 2010 Apr 7;16(4):651–660. doi: 10.1017/S1355617710000421

Table 6.

Cox proportional hazards model

Variable	B	Wald χ²	df	p	HR	95% CI for HR
Age (years)	0.13	13.0^**	1	< .01	1.1	1.1–1.2
Education (years)	-0.16	2.0	1	.16	0.9	0.7–1.1
Group		14.4^**	2	< .01
MCI vs. Control	3.8	12.9^**	1	< .01	45.2	5.6–362.4
AD vs. Control	4.3	13.7^**	1	< .01	72.9	7.5–704.4
AD vs. MCI	0.5	0.6	1	.43	1.6	0.5–5.3

Note. HR = hazards ratio; CI = confidence interval; MCI = mild cognitive impairment; AD = Alzheimer's disease.

^**

= p < .01.