Systemic lupus erythematosus
The rate of SLE varies between countries, ethnicity, and sex, and changes over time. In the United States, one estimate of the rate of SLE is 53 per 100,000; other estimates range from 322,000 to over 1 million. In Northern Europe the rate is about 40 per 100,000 people. SLE occurs more frequently and with greater severity among those of non-European descent. That rate has been found to be as high as 159 per 100,000 among those of Afro-Caribbean descent. Childhood-onset systemic lupus erythematosus generally presents between the ages of 3 and 15 and is four times more common in girls.
Disability in the United States
According to the "Disability Status: 2000 - Census 2000 Brief" approximately 20% of Americans have one or more diagnosed psychological or physical disability:
Census 2000 counted 49.7 million people with some type of long lasting condition or disability. They represented 19.3 percent of the 257.2 million people who were aged 5 and older in the civilian non-institutionalized population -- or nearly one person in five..."
This percentage varies depending on how disabilities are defined. According to "Census Brief 97-5", "About 1 in 5 Americans have some kind of disability, and 1 in 10 have a severe disability."