Experimental interventions and their definitions
| Experimental interventions | Definition |
| Psychoeducation (PE) | An intervention in which patients are only provided information about their disease. |
| Supportive psychotherapy (SP) | An intervention with or without a psychoeducational component, intended as sessions in which patients were administered an active, although non-specific, psychological treatment. |
| Physiological therapies (PT) | An intervention that uses some kind of physical training (eg, breathing retraining, progressive muscle relaxation, applied relaxation) in order to reduce the physiological manifestations of anxiety. |
| Behaviour therapy (BT) | An intervention with or without physiological components, aiming at patients’ habituation or extinction to anxiety provoking situations and sensations through some kind of exposure (eg, interoceptive, in vivo). |
| Cognitive therapy (CT) | An intervention with or without physiological components and behavioural experiments, aiming at the modification of maladaptive thoughts through some kind of cognitive restructuring. |
| Cognitive–behavioural therapy (CBT) | An intervention, with or without physiological components, containing both cognitive and behavioural therapy elements. |
| Third-wave CBT (3W) | An intervention including acceptance and commitment therapy, mindfulness-based therapy, and other so-called ’third-wave’ therapies administered with or without other CBT components (eg, exposure, cognitive restructuring, breathing retraining, muscle relaxation). |
| Psychodynamic therapies (PD) | Focused on revealing and resolving intrapsychic or unconscious conflicts. |