Table 1.

Overview of sessions.

Week	Content and homework
	Browser	Mobile
1	Psychoeducation: Information about panic Defining goals of training Setting up a reward list	Daily diary Registration of current panic event (event-based) Daily summary of panic, avoidance, and mood
2	Interoceptive exposure: Bodily symptoms during panic Avoidance Safety behaviors	Respiratory interoceptive exposure exercises Daily diary
3	In vivo exposure: Defining an anxiety hierarchy	In vivo exposures Dizziness interoceptive exercises Daily diary
4	Cognitive restructuring I: Negative automatic thoughts Defining anxiety project (training schedule for exposures)	In vivo exposures Further interoceptive exposure exercises Daily diary
5	Cognitive restructuring II: Reality testing of automatic negative thoughts	In vivo exposures Further interoceptive exposure exercises Daily diary
6	Relapse prevention: Early warning signs Critical life events Evaluation of training and aims	Breathing and muscle relaxation exercises