Characteristics of the most severely ill and injured patients in a Norwegian helicopter emergency medical service: a retrospective cohort study.

"Declarations Ethics approval and consent to participateThe study was assessed by the Regional Ethics Committee (REC) for Health and Medical Research of Central Norway (582416/2023), which found the study to be a health service quality project not governed by the Norwegian Health Research Act. REC approved waiving the informed consent from patients included in the study. The study was performed in accordance with the Helsinki declaration for medical research involving human subjects. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Open access funding provided by Norwegian University of Science and Technology No funding was obtained for this study."