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Epidemiologic studies on systemic lupus erythematosus. Comparative data for New York City and Jefferson County, Alabama, 1956-1965.

A comparative population study on SLE from 1956–1965 revealed higher attack rates in New York City than in Jefferson County, Ala. The difference was attributed to more complete case-finding in New York rather than to regional differences in predisposing factors. In both localities, incidence, prevalence and mortality rates were approximately three times higher for Negro females than for whites. In males, however, few cases were observed, and ethnic differences were considered equivocal.