Table 3.

Trends in ambulatory prescription costs, out of pocket costs, total medical costs and the proportion of costs due to prescription drugs (2006 dollars) (only even years shown).

Medical Care	2000	2002	2004	2006	P value
Ambulatory prescription costs, mean ($, SE)	2645 (172)	3270 (184)	3726 (243)	4680 (315)	0.0001
RA specific ambulatory prescription costs, mean ($, SE)	396 (62)	592 (98)	547 (78)	984 (166)	0.014
Out-of-pocket prescription costs, mean ($, SE)	842 (82)	854 (55)	924 (65)1	832 (68)	0.682
Total medical costs, mean ($, SE)	16563 (1714)	18310 (1484)	17783 (1714)	19510 (1365)	0.070
Proportion of total medical costs due to prescription medications (%, SE)	30.2 (1.90)	31.9 (1.77)	36.6 (1.97)	37.5 (1.93)	0.001