procedure
To be included in the meta-analysis, studies had to meet four criteria: (1) patients were aged 18 to 65 and met DSM-III-R, DSM-IV, or DSM-5 diagnostic criteria for specific anxiety-related disorders; (2) patients were randomly assigned to either CBT or a placebo (pill or psychological); (3) anxiety symptom severity was assessed via a validated clinical interview or self-report instrument pre- and post-treatment; and (4) studies provided sufficient data to calculate effect sizes.

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