All of the vasculitides are classified as rare diseases. A rare disease (also called an orphan disease) is a disease or condition affecting fewer than 200,000 persons in the United States. An estimated 25 million people in the United States have a rare disease. Statistics are not available for many of the diseases.

Giant cell arteritis: 20/100,000

Hypersensitivity angiitis: 6/100,000

Polyarteritis nodosa: 3/100,000

Takayasu’s arteritis: 1/100,000

Wegener’s Granulomatosis: 3/100,000 in the United States (The exact number of patients is not known, but a very rough estimate is two new cases per million Americans per year, or about 500 new cases diagnosed each year.)
• The disease can occur at any age; however, it has its peak in the 4th or 5th decade of life.
• It affects males and females equally.
• 85% of patients are above age 19.
• The currently reported age range of patients is 5-91 years.
• The mean age of patients is 41.
• 97% of all patients are Caucasian, 2% are Black, 1% are of another race.

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Attachment	Size
Survey Results - Oct. 1997 Part I (surveypage01.pdf)	88.75 KB
Survey Results - Oct. 1997 Part II (surveypage02.pdf)	19.11 KB
Survey Results - Oct. 1997 Part III (surveypage03.pdf)	9.88 KB
Survey Results - Oct. 1997 Part IV (surveypage04.pdf)	12.16 KB
Survey Results - Oct. 1997 Part V (surveypage05.pdf)	7.21 KB
Survey Results - Oct. 1997 Part VI (surveypage06.pdf)	7.92 KB
Survey Results - Oct. 1997 Part VII (surveypage07.pdf)	11.08 KB
Survey Results - Oct. 1997 Part VIII (surveypage08.pdf)	10.38 KB
Survey Results - Oct. 1997 Part IX (surveypage09.pdf)	10.97 KB
Survey Results - Oct. 1997 Part IX B (surveypage09.pdf)	10.97 KB
Survey Results - Oct. 1997 Part X (surveypage10.pdf)	11.29 KB
Survey Results - Oct. 1997 Part XI (surveypage11.pdf)	6.69 KB
Survey Results - Oct. 1997 Part XII (surveypage12.pdf)	7.25 KB
Survey Results - Oct. 1997 Part XIII (surveypage13.pdf)	11.01 KB
Survey Results - Oct. 1997 Part XIV (surveypage14.pdf)	11.91 KB
Survey Results - Oct. 1997 Part XV (surveypage15.pdf)	9.94 KB
Survey Results - Oct. 1997 Part XVI (surveypage16.pdf)	7.8 KB
Survey Results - Oct. 1997 Part XVII (surveypage17.pdf)	8.09 KB
Survey Results - Oct. 1997 Part XVIII (surveypage18.pdf)	6.94 KB
Survey Results - October 1997 (Whole Document) (Survey Results - October 1997.pdf)	221.39 KB