*4.4. Limitations*

The low number of participants in this study constitutes a limitation regarding generalizability of the results, especially concerning the results of the outcome measures. However, the main purpose of this study was to assess feasibility and not to investigate statistical effects. The participating children had different types of injuries and a large span in time since injury, which was considered a strength, while the restricted variation in age should be considered a limitation. In addition, the parents' educational level was high and all parents were married, which reduces the generalizability of the findings.

#### **5. Conclusions**

The findings from the CICI feasibility study indicate high intervention feasibility and acceptability, particularly for the parents. As the use of external strategies in cognitive rehabilitation of children with ABI tends to be the most reliable approach, it was considered acceptable and to a certain degree expected that the alliance and communication with the parents was superior to that of the children. The focus on SMART-goals was perceived as useful by all participants, and including schools in the intervention proved beneficial. The telerehabilitation format seems acceptable, although some concerns regarding the engagement of children need to be monitored. The number of neuropsychological tests and questionnaires was reduced, and new primary outcome measures were defined as parent-reported brain injury symptom severity (HBI) and enhanced parenting self-efficacy (TOPSE). Except for this, no major adjustments to the protocol were made (see protocol article by Rohrer-Baumgartner et al. (2022) REF).

**Author Contributions:** Conceptualization and methodology: I.L.H., N.R.-B., M.L., E.J.S., S.L.H., M.V.F., I.M.H.B., H.P.Ø., I.K., A.P.S.-S., J.E., C.R. and S.L.W.; recruitment, intervention and data collection: I.L.H., N.R-B., E.J.S. and A.P.S.-S.; project management: M.L.; data analysis: I.L.H., N.R.-B. and M.L.; writing—original draft preparation: I.L.H., N.R.-B. and M.L.; writing—review and editing: I.L.H., N.R.-B., M.L., E.J.S., S.L.H., M.V.F., I.M.H.B., H.P.Ø., I.K., A.P.S.-S., J.E., C.R. and S.L.W. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by The Norwegian Research Council, grant number 288172.

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Data Protection Office at Sunnaas Rehabilitation Hospital (approval number: REK 2019/1283, Trial registration: ClinicalTrials.gov (accessed on 1 January 2020) Identifier: NCT04186182).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study who were 16 years of age or older. Children under the age of 16 received age-appropriate information about the study before participating.

**Data Availability Statement:** The data presented in this study are not publicly available due to protection of privacy.

**Acknowledgments:** We would like to thank all participants for their contribution to this study.

**Conflicts of Interest:** The authors declare no conflict of interest.
