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How common is systemic lupus erythematosus (SLE) ?
The prevalence of SLE in the United States is around 40/100,000 (0.04%).
It has a peak age of onset of 20 to 40 years and is more common in women and certain ethnic groups (especially African Americans).
How often is lupus nephritis present in patients with this disease
Kidney involvement occurs in 40% of patients with systemic lupus erythematosus, and the kidney is the most common major organ affected.
