Bakker 2000.

Methods	Randomised trial with concurrent eligible patients outside of the RCT. The eligible but non‐RCT patients were not in the RCT because of patients preference for no medication (31 patients). Patients with panic disorder who had had more than 3 attacks during the last three weeks. Nine (26 %) of the 35 RCT cognitive therapy patients dropped out and seven (23%) of the 31 non‐RCT cognitive therapy patients were lost to follow up.
Data	Characteristics of non‐RCT patients compared to RCT patients who received the same treatment not presented. The majority of patients were female (74% combined groups) and of average age of 34 (SD 8) years.
Comparisons	Two RCT arms, the experimental arm was compared with similarly treated non‐RCT patients. The experimental group received 12 week of cognitive therapy. The control arm was placebo.
Outcomes	Clinical outcomes were assessed in all patients who were followed up. Patients were followed for up for 12 weeks. Main outcome reported in this study was frequency of panic attacks.
Notes	?