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An analysis of 43,706 adults from the 1999-2014 National Health and Nutrition Examination Surveys (NHANES) demonstrated temporal trends in the prevalence of arthritis, including a rise in osteoarthritis (OA) from 6.6% to 14.3%, while the prevalence of rheumatoid arthritis (RA) decreased from 5.9% to 3.8% in the USA, (Citation source https://buff.ly/2o6fhkW)
Overall the age-adjusted prevalence of self-reported doctor diagnosed arthritis was 24.7%, and did not change significantly over time. OA was most prevalent ( 9.7%) and RA was next at 4.2%;
Increase in OA prevalence was significant in both genders; in non-Hispanic Whites, non-Hispanic Blacks, and Hispanics; and in people with high socioeconomic status.
Decrease in RA prevalence was more pronounced in men, non-Hispanic Blacks, and participants with low income or obesity.