Table 4 PubMed Search Strategy

#1. infant*[Title/Abstract] OR newborn*[Title/Abstract] OR child*[Title/Abstract] OR "preschool child*"[Title/Abstract] OR juvenile*[Title/Abstract] OR preschool*[Title/Abstract] OR adolescent*[Title/Abstract] OR pediatric*[Title/Abstract] OR paediatric*[Title/Abstract] OR "young people"[Title/Abstract] OR "young person"[Title/Abstract]

#2. "Child"[Mesh] OR "Infant"[Mesh] OR "Adolescent"[Mesh] OR "Pediatrics"[Mesh]

#3. #1 OR #2

#4. ambulance*[Title/Abstract] OR "transportation of patient*"[Title/Abstract] OR "emergency service*"[Title/Abstract] OR "emergency medical service*"[Title/Abstract] OR EMS[Title/Abstract] OR "emergency health service*"[Title/Abstract] OR "prehospital care"[Title/Abstract] OR prehospital*[Title/Abstract] OR pre-hospital*[Title/Abstract] OR "out of hospital"[Title/Abstract] OR "out of hospital care"[Title/Abstract] OR "emergency medicine"[Title/Abstract] OR "pediatric emergency medicine"[Title/Abstract] OR "paediatric emergency medicine"[Title/Abstract] OR "emergency responder*"[Title/Abstract] OR "first responder*"[Title/Abstract] OR "emergency medical technician*"[Title/Abstract] OR "emergency technician*"[Title/Abstract] OR "emergency practitioner*"[Title/Abstract] OR " emergency medical practitioner*"[Title/Abstract] OR "emergency care practitioner*"[Title/Abstract] OR EMT[Title/Abstract] OR "rescue personnel*"[Title/Abstract] OR "emergency nurse*"[Title/Abstract] OR paramedic*[Title/Abstract]

#5. "Emergency Medical Services"[Mesh] OR "Emergency Medicine"[Mesh] OR "Emergency Medical Technicians"[Mesh]

#6. #4 OR #5

#7. "pain management*"[Title/Abstract] OR "pain treatment*"[Title/Abstract] OR "pain intervention*"[Title/Abstract] OR analgesi*[Title/Abstract] OR analgaesi*[Title/Abstract] OR "analgetic agent*"[Title/Abstract] OR "analgesic drug*"[Title/Abstract] OR anodynes[Title/Abstract] OR antinociceptive[Title/Abstract] OR NSAIDs[Title/Abstract] OR paracetamol[Title/Abstract] OR ketamine[Title/Abstract] OR fentanyl[Title/Abstract] OR "nitrose oxide"[Title/Abstract] OR methoyloxine[Title/Abstract] OR morphine[Title/Abstract] OR opoid[Title/Abstract] OR non-opoid[Title/Abstract] OR narcotics[Title/Abstract] OR non-narcotics[Title/Abstract] OR "regional nerve block*"[Title/Abstract] OR "per oral"[Title/Abstract] OR peroral[Title/Abstract] OR intravanous[Title/Abstract] OR "intra venous"[Title/Abstract] OR IV[Title/Abstract] OR intramuscular[Title/Abstract] OR "intra muscular"[Title/Abstract] OR "intra nasal"[Title/Abstract] OR intranasal[Title/Abstract] OR inhalational[Title/Abstract] OR "pain reduction"[Title/Abstract] OR "pain relief"[Title/Abstract] OR oligoanalgesia[Title/Abstract] OR "pain intensity"[Title/Abstract] OR "pain assessment"[Title/Abstract] OR "pain measurement"[Title/Abstract] OR effectiveness[Title/Abstract] OR "effect management"[Title/Abstract] OR "side effect*"[Title/Abstract] OR "adverse effect*"[Title/Abstract] OR "adverse event*"[Title/Abstract]

#8. "Pain Management"[Mesh] OR "Analgesia"[Mesh] OR "Analgesics"[Mesh] OR "Nerve Block"[Mesh] OR "Fentanyl"[Mesh] OR "Ketamine"[Mesh] OR "Morphine"[Mesh] OR "Acetaminophen"[Mesh] OR "Drug Administration Routes"[Mesh] OR "Pain Measurement"[Mesh]

#9. #7 OR #8

#10. #3 AND #6 AND #9

#11. #3 AND #6 AND #9 Filters: Humans, Danish, English, Norwegian, Swedish, Child: birth-18 years, from 2000—2020