Table 2.

Annual incidence of ankylosing spondylitis in Olmsted County, Minnesota residents ≥ 18 years of age, 1980-2009 by sex and age group (Modified New York Criteria)

	Male		Female		Total
Age group	No. of patients	Rate per 100,000	No. of patients	Rate per 100,000	No. of patients	Rate per 100,000
18-24 years	10	6.4	3	1.8	13	4.0
25-34 years	27	9.4	8	2.7	35	6.0
35-44 years	19	7.2	5	1.9	24	4.5
45-54 years	9	4.3	2	0.9	11	2.6
55-64 years	1	0.7	1	0.7	2	0.7
≥65 years	1	0.7	0	0.0	1	0.3
Total (95% CI)	67	4.9 (3.7, 6.1)†	19	1.3 (0.7, 1.9)†	86	3.1 (2.5, 3.8)‡

*Values are the annual incidence rate (95% confidence interval [95% CI]) per 100,000 population

^†Age-adjusted to the 2000 US white population.

^‡Age- and sex-adjusted to the 2000 US white population.