Introducing an on-site Helicopter Emergency Medical Service (HEMS) physician at the Emergency Medical Communication Centre - implications for dispatch precision at a Norwegian HEMS base

Table 1 Group design for working and non-working hours

	Pre-intervention period Feb 1 to Jul 5 years 2022 and 2023	Intervention period Feb 1 to Jul 5 year 2024
Working hours Mon-Thu 10am-10pm Fri 8am to 4pm	No intervention (A1)	Intervention (A2)
Non-working hours Mon-Thu 10pm-10am Fri 4pm-Mon 10am	No intervention (B1)	No intervention (B2)

ISSN: 1757-7241