Inclusion Criteria:

• Subjects must meet one of the following 6 diagnoses: a. A current diagnosis of panic disorder with or without agoraphobia; b. Generalized anxiety disorder with a history of at least one panic attack in the course of their illness; c. Social anxiety disorder (social phobia) with a history of at least one panic attack in the course of their illness; d. Separation anxiety with a history of at least one panic attack in the course of their illness; e. Posttraumatic stress disorder with a history of at least one panic attack in the course of their illness; f. Anxiety not otherwise specified with a history of at least one panic attack in the course of their illness.
• Educational level, intelligence, or other mental condition in the subject and/or his/her parent(s) are judged by the investigator to be sufficient to permit adequate informed consent/assent to be obtained, and for study procedures to be complied with.

Exclusion Criteria:

• Current (in the past 6 months) diagnosis of obsessive compulsive disorder, major depressive disorder, dysthymic disorder, or alcohol and/or substance dependence.
• Current (in the past 3 months) diagnosis of alcohol and/or substance abuse.
• Primary diagnosis of conduct disorder, oppositional defiant disorder, or Attention Deficit Hyperactivity Disorder.
• Any current or past history of schizophrenia or psychosis; bipolar disorder or cyclothymia; dementia, delirium or other organic brain disease; an eating disorder; mental retardation, Asperger's disorder, or any other serious developmental disorder.
• A Childhood Depression Rating Scale, Revised score >35.