Table 1.

Demographic characteristics of a cohort of patients with rheumatoid arthritis (RA), California, 1991–2002

Variable	Whole cohort (n = 84,475) n (%)	RA patients diagnosed with cancer (n = 5,533) n (%)
Sex
Female	65,236 (77.2)	3,717 (67.2)
Male	19,239 (22.8)	1,816 (32.8)
Age -at hospitalization
<40	5,616 (6.7)	75 (1.4)
40–59	20,970 (24.8)	931 (16.8)
60–79	43,316 (51.3)	3,741 (67.6)
80+	14,573 (17.2)	786 (14.2)
Race
Non-Hispanic White	60,883 (72.1)	4,306 (77.8)
Non -Hispanic Black	6,517 (7.7)	392 (7.1)
Hispanic	11,651 (13.8)	596 (10.8)
Non-Hispanic Asian/Pacific Islander	3,693 (4.4)	194 (3.5)
Other/Unknown	1,731 (2.0)	45 (0.8)
Period of hospitalization
1991–1994	33,354 (39.5)	3000 (54.2)
1995–1998	28,266 (33.5)	1,894 (34.2)
1999–2001	22,855 (27.0)	639 (11.6)
Period diagnosed with cancer
1991–1994		808 (14.6)
1995–1998		1,919 (34.7)
1999–2002		2,806 (50.7)