Table 2.

The effect of dementia and AD on per capita annual medicare costs (2003)^a

	N	Disease $	N	Control $	Unadjusted difference $b	Pb	Adjusted* difference $c	Pc
Dementia
Claims	280	11,270	451	4,135	7,135	< 0.001	6,177	< 0.001
Adams	254	10,523	477	4,839	5,684	< 0.001	3,792	0.01
AD
Claims	162	8,657	569	5,249	3,408	0.02	1,253	0.43
Adams	189	9,240	542	5,231	4,009	0.01	1,087	0.53

^a27 persons who died prior to 2003 are excluded from all cost analyses, but are included in Table 1.

^bUnadjusted difference is the increase in amount that Medicare spent on care for those with disease (dementia or AD) compared to those without (controls). P value is for t test of means. Analyses run using sample weights.

^cAdjusted difference is a regression coefficient showing the increase in Medicare costs associated with having dementia. Results are from regression analysis of total 2003 Medicare expenditures while controlling for demographic factors (age, sex, race, marital status, income, education), residence (nursing home v. community), controls for death during 2003, and time survived during 2003 (No. months). Analyses run using sample weights.