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Anxiety disorders are the most prevalent psycho-pathological problem in European countries. According to US statistics, the prevalence of specific phobias ranges between 8.8 and 12.5% of the general population. Although few of the persons who show specific fears come into the category of phobic, nearly 11% of such people have fears serious enough to affect their lives significantly.

Reference:

Mª Isabel Viedma del Jesús. Department of Personality, Evaluation and Psychological Treatment of the University of Granada.

1. About one in three people with panic disorder develop agoraphobia. 
2. Panic disorder typically develops in early adulthood or late adolescence. 
3. Approximately 2.4 million American adults have panic disorder.
4. Only 1 out of 4 people with panic disorder receive treatment.
5. Approximately 1 out of 75 people may experience panic disorder.

Source  (National Institutes of Mental Health)

1. Twice as many women suffer panic disorder than men.
2. Roughly 50-60% of those who suffer from panic disorder also suffer from a major depressive disorder. 
3. Panic disorder is diagnosed when a person suffers at least two unexpected panic attacks and seriously worries about having future attacks or changes their behavior to avoid or minimize future attacks.
4. Roughly 10% of healthy people experience an isolated panic attack in a given year.
5. Most panic attacks last less than 30 minute

Source (U.S. Surgeon Generalís Report, 1999)