200,000 Americans (NHLBI estimate); 50,000 diagnosed. ... see also overview of Narcolepsy.
approx 1 in 1,359 or 0.07% or 200,000 people in USA [Source statistic for calcuation: "200,000 Americans (NHLBI estimate); 50,000 diagnosed." -- see also general information about data sources]
Narcolepsy is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Narcolepsy, or a subtype of Narcolepsy, affects less than 200,000 people in the US population.
estimated 150,000 undiagnosed (based on NHLBI estimates) ... see also misdiagnosis of Narcolepsy.
approx 1 in 1,813 or 0.06% or 150,000 people in USA [about data] ... Note: this rate calculation uses the following statistic: estimated 150,000 undiagnosed (based on NHLBI estimates)
Although it is estimated that narcolepsy afflicts as many as 200,000 Americans, fewer than 50,000 are diagnosed. (Source: excerpt from Narcolepsy: NWHIC)
The term 'prevalence' of Narcolepsy usually refers to the estimated population of people who are managing Narcolepsy at any given time. The term 'incidence' of Narcolepsy refers to the annual diagnosis rate, or the number of new cases of Narcolepsy diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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