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Table 1 Time intervals and their method of calculation

From: Training emergency services’ dispatchers to recognise stroke: an interrupted time-series analysis

Time interval Method of calculation
Call to arrival at scene Time ambulance arrived at scene minus time call made to EMS
Call to arrival at hospital Time ambulance arrived at hospital minus time call made to EMS; If time arrived at hospital was missing, time of admission to hospital was used instead; if both these were missing, time of triage was used.