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"Respondents were classified as having arthritis if they answered “yes” to the question, “Has a doctor, nurse, or other health professional ever told you that you had some form of arthritis, rheumatoid arthritis, gout, lupus, or fibromyalgia?” Respondents were classified as veterans if they answered “yes” when asked, “Have you ever served on active duty in the United States Armed Forces, either in the regular military or in a National Guard or military reserve unit?”"

Persons of Hispanic or Latino (Hispanic) origin might be of any race but are categorized as Hispanic; all racial groups are non-Hispanic. Persons self-identifying as American Indian or Alaska Native, Asian, Native Hawaiian or other Pacific Islander, other race, or multiracial were combined into “Other.”