PMC

Percentage of patients with different levels of severity for anxiety. Levels of severity for anxiety based on Hospital Anxiety and Depression Scale. First screening is during recruitment; second screening is at follow-up assessment 3 months later. Subjects (n = 50) are those that consented to participate in the EEG biofeedback. Thirty-eight of the subjects completed all 5 sessions, and 12 of them dropped out after 3 or 4 sessions. Dropouts (n = 65) declined to participate in the therapy but agreed to be psychologically assessed.