A meta-analysis of treatments for panic disorder.

In a meta-analysis, the authors compared the effectiveness of psychological and pharmacological treatments for panic disorder. Percentage of agoraphobic subjects in the sample and duration of the illness were unrelated to effect size (ES). Type of dependent variable was generally unrelated to treatment outcome, although behavioral measures yielded significantly smaller ESs. Dependent measures of general anxiety, avoidance, and panic attacks yielded larger ESs than did depression measures. Choice of control was related to ES, with comparisons with placebo controls greater than comparisons with exposure-only or "other treatment" controls. Psychological coping strategies involving relaxation training, cognitive restructuring, and exposure yielded the most consistent ESs; flooding and combination treatments (psychological and pharmacological) yielded the next most consistent ESs. Antidepressants were the most effective pharmacological intervention.