Table 1.

The prevalence of HLA-B27 for US adults ages 20–69 years, by selected characteristics, NHANES 2009

Selected Characteristic	Number	Total number	Percentage	SE	95 % CI
Overall US prevalence	124	2,320	6.1	0.8	(4.6–8.2)
Gender
Males	53	1,123	5.8	1.0	(3.9–8.4)
Females	71	1,197	6.5	1	(4.7–8.9)
Race/ethnic groups
Non-Hispanic Whites	79	1,021	7.5	1.2	(5.3–10.4)
Mexican-Americans	27	622	4.6	0.6	(3.4–6.1)
Non-Hispanic Blacks	4	345	1.1	0.5	(0.4–3.1)
Age groups
20–29 years	39	498	8.0	2.0	(4.6–13.4)
30–39 years	26	471	5.6	1.3	(3.4–9.2)
40–49 years	34	508	8.1	1.2	(5.8–11.2)
50–59 years	11	404	2.9	0.9	(1.4–5.8)
60–69 years	14	439	4.6	1.9	(1.9–10.7)