Table 3.

Prevalence of SpA in US adults 20 – 69 years of age: the NHANES 2009–2010^*

Case type	Total population sampled	Number of SpA cases	Prevalence, %	SE	95% CI
Amor SpA
Overall (definite and probable)†	5,103	43	0.9	0.1	0.7–1.1
Age group
20–49 years	3,188	17	0.5‡	0.2	0.2–1.2
50–69 years	1,915	26	1.5	0.3	1.0–2.3
Sex†
Male	2,472	11	0.4‡	0.1	0.2–0.7
Female	2,631	32	1.3	0.2	0.9–1.8
Race/ethnicity group†
Mexican American	1,024	6	0.6‡	0.3	0.2–1.7
Non-Hispanic white	2,244	24	1.0	0.2	0.7–1.5
Non-Hispanic black	963	9	0.9‡	0.3	0.4–1.8
ESSG SpA
Overall†	5,103	70	1.4	0.2	1.0–1.9
Age group
20–49 years	3,188	49	1.5	0.2	1.1–2.0
50–69 years	1,915	21	1.3	0.4	0.7–2.5
Sex†
Male	2,472	24	1.1	0.3	0.6–2.0
Female	2,631	46	1.7	0.3	1.2–2.5
Race/ethnicity group†
Mexican American	1,024	15	1.5‡	0.5	0.7–3.0
Non-Hispanic white	2,244	38	1.5	0.3	1.0–2.3
Non-Hispanic black	963	9	0.9‡	0.3	0.4–1.8

^*SpA = spondylarthritis; NHANES = National Health and Nutrition Examination Survey; 95% CI = 95% confidence interval; ESSG = European Spondylarthropathy Study Group.

^† Estimates were age adjusted to the midpoint of the current population survey estimate for the 2010 US civilian population. For race/ethnicity, only data for the major US subgroups are shown.

^‡ Estimate potentially statistically unreliable.