. Author manuscript; available in PMC: 2014 Mar 1.

Published in final edited form as: Alzheimers Dement. 2012 Nov 2;9(2):204–207. doi: 10.1016/j.jalz.2012.01.003

Table 1.

Multivariate Cox regression model

							95% CI

Variable	B	SE	Wald	df	Significance	Exp (B)	Lower	Upper
NPI^*			9.94	2	0.007
All domains 1–3	0.10	0.35	0.08	1	0.779	1.10	0.56	2.17
At least one domain 4+	0.91	0.31	8.70	1	0.003	2.48	1.36	4.54
AD onset age	−1.09	0.32	11.67	1	0.001	0.34	0.18	0.63
AD onset age²	0.01	0.002	12.38	1	<0.001	1.01	1.003	1.011
Female	0.64	0.32	4.05	1	0.044	1.90	1.02	3.56
Education—less than high school^†	0.55	0.34	2.63	1	0.105	1.73	0.89	3.35

Reference category is NPI total score = 0.

^†

Reference category is greater than or equal to high school.