Please assess the completion status of the following clinical trial:

Trial Title: Biofeedback Intervention in Adolescents With Autism Spectrum Disorder

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Written informed consent/assent~* Male/female~* 13-18 years old~* For adolescents with ASD only: Confirmed ASD-diagnosis (DSM-IV/V)~Exclusion Criteria:~* Presence of intellectual disability (DSM-IV/V)~* Hearing- or vision impairment without appropriate correction~* Presence of congenital heart diseases, diagnosed cardiovascular abnormalities or somatic diseases~* Pregnancy~* Insufficient knowledge of Dutch language~* Participation in other Clinical Trial(s)~* For typically developing adolescents only: Presence of neurodevelopmental disorder or psychiatric disorder (DSM-IV/V) + Presence of a sibling with a neurodevelopmental disorder (DSM-IV/V)

- Gender: ALL
- Minimum Age: 13 Years
- Maximum Age: 18 Years
- Healthy Volunteers: t

Study Arms:
- Supervised RSA biofeedback (Type: EXPERIMENTAL): 5 weeks with weekly supervised sessions of 30 minutes and daily home practice sessions of 20 minutes. The latter sessions can be divided into four bouts of 5 minutes which can be spread across the day. The main goal during this intervention is to breath at resonance frequency which is slower than the usual breathing frequency. Participants will be guided towards this lower breathing frequency by using appropriate breathing techniques and the provision of a breathing pacer during the supervised sessions. During home practice, the participants will be provided with an application which will visualise a breathing pacer at their resonance frequency. At the third session, participants will no longer receive a breathing pacer but are instructed to breath in phase with their heart rate which is visualised on the computer screen instead of the breathing pacer.
- Supervised sham RSA biofeedback (Type: SHAM_COMPARATOR): 5 weeks with weekly supervised sessions of 30 minutes and daily home practice sessions of 20 minutes. The latter sessions can be divided into four bouts of 5 minutes which can be spread across the day. The sham-control treatment will follow the same steps as outlined in the supervised intervention arm. However, the participants in this control group will not receive any information regarding their own heart rate and they will not practice at their resonance frequency. Instead, a default mode will be shown during the sessions and in their application for home practice.
- Non-supervised RSA biofeedback (Type: EXPERIMENTAL): 1 short guided session (30 minutes) and daily practice (20 minutes; 4 bouts of 5 minutes) for 5 weeks. The biofeedback protocol will be provided by an application, similar to the supervised protocol but without guidance throughout the sessions, except for the first session. During this first session, the information will be provided about the application and the heart rate sensor (Polar band) which will detect changes in heart rate during the training. In addition, the resonance frequency of the participant will be determined so they can practice breathing at this frequency for the next 5 weeks.
- No intervention (Type: NO_INTERVENTION): No intervention is given.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: terminate
termination_type: enrollment issues