Mortality after paediatric emergency calls for patients with or without pre-existing comorbidity: a nationwide population based cohort study

Table 3 Mortality estimates from Poisson regression on individual patient level versus mission level

		Original dataset with PINs			Dataset with or without PINs
		First-time missions (patient level)	Last-time missions (patient level)	All missions (mission level)	All missions (mission level*)
	N	76,956	76,956	99,281	101,094
1-day	Deaths (no.)	175	206	223	273
	Risk (%)	0.23	0.27	0.22	0.27
	95% CI	0.20;0.26	0.23;0.31	0.20;0.26	0.24;0.30
7-day	Deaths (no.)	218	255	276	NA
	Risk (%)	0.28	0.33	0.28
	95% CI	0.25;0.32	0.29;0.37	0.25;0.31
30-day	Deaths (no.)	231	282	318	NA
	Risk (%)	0.30	0.37	0.32
	95% CI	0.26;0.34	0.33;0.41	0.29;0.36

PIN Personal identification number
*Data contained both patients with and without valid personal identification numbers retrieved from out-of-hospital electronic medical records. From here we identified out-of-hospital deaths (comparable to 1-day mortality) by the following definition: either (1) the patient had been ‘declared dead on scene’ by a prehospital physician (i.e. the patient had certain signs of death when the EMS arrived) or (2) the patient had a Glasgow Coma Score of 3 plus any of the variables that are transferred into the Danish Cardiac Arrest Registry [24].

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