Table 1.

Demographic characteristics of a cohort of patients with systemic lupus erythematosus (SLE), California, 1991–2002 (n = 30,478)

Variable	Whole cohort (n = 30,478) n (%)	SLE patients diagnosed with cancer (n = 1,273) n (%)
Sex
Female	27,133 (89.0)	1,053 (82.7)
Male	3,345 (11.0)	220 (17.3)
Age -at hospitalization
<40	10,801 (35.4)	177 (13.9)
40–59	11,293 (37.1)	447 (35.1)
60+	8,384 (27.5)	649 (51.0)
Race
Non-Hispanic White	17,593 (57.7)	872 (68.5)
Non -Hispanic Black	4,504 (14.8)	143 (11.2)
Hispanic	5,661 (18.6)	182 (14.3)
Non-Hispanic Asian/Pacific Islander	2,052 (6.7)	61 (4.8)
Other/Unknown	668 (2.2)	15 (1.2)
Period of hospitalization
1991–1994	11,252 (36.9)	731 (57.4)
1995–1998	10,857 (35.6)	419 (32.9)
1999–2001	8,369 (27.5)	123 (9.7)
Period diagnosed with cancer
1991–1994	-	808 (14.6)
1995–1998	-	1,919 (34.7)
1999–2002	-	2,806 (50.7)