TABLE 4.

Age-Adjusted Incidence Rates of Invasive Anal Cancer in the San Francisco/Oakland Cancer Registry by Sex, Age Group, Race, and Calendar Period

	Rate per 100,000 Population
Characteristic	2000–2004	2005–2009	RR (95% CI)	P
Overall	2.51	2.50	1.00 (0.86–1.15)	.97
Males	2.88	2.72	0.95 (0.77–1.15)	.60
Age, y
20–34	a	a
35–49	2.52	2.36	0.94 (0.65–1.35)	.78
50–64	4.98	4.91	0.99 (0.73–1.37)	.73
≥65	5.34	5.00	0.94 (0.63–1.40)	.81
Race
White	3.38	3.27	0.97 (0.78–1.20)	.81
Black	4.27	3.52	0.82 (0.45–1.50)	.60
Other/unknown	a	a
Females	2.16	2.26	1.04 (0.85–1.29)	.71
Age, y
20–34	a	a
35–44	1.44	1.00	0.70 (0.40–1.19)	.20
50–64	4.17	4.27	1.02 (0.74–1.42)	.95
≥65	4.58	5.83	1.28 (0.91–1.78)	.16
Race
White	2.71	2.79	1.03 (0.82–1.30)	.85
Black	2.28	2.82	1.24 (0.63–2.44)	.61
Other/unknown	a	a

Abbreviation: 95% CI, 95% confidence interval; RR, rate ratio.

^aData are not shown for rates based on fewer than 16 cases.