Excellent agreement of Norwegian trauma registry data compared to corresponding data in electronic patient records

Table 3 Intraclass correlation coefficient (ICC) for continuous variables

Variable	Patients (n)	Number of missing registrations		Number of registrations^a	Observed agreement		ICC^d (95% CI)	Mean diff.^e	SD^f
Variable	Patients (n)	NTR	EPR	Number of registrations^a	Observed agreement (%)^b	Conc.(N); non-conc. (N)^c	ICC^d (95% CI)	Mean diff.^e	SD^f
*Prehospital data*:
Pre-hospital SBP	150	14	5	136	86.8	118; 18	0.88 (0.83–0.91)	2.76	12.57
Pre-hospital RR	140	12	7	127	96.1	122; 5	0.99 (0.98–0.99)	0.02	0.94
*Emergency admission data*:
In-hospital SBP	172	4	2	168	91.7	154; 14	0.99 (0.98–0.99)	-0.11	3.44
In-hospital RR	169	5	4	163	96.3	157; 6	0.99 (0.99-1.00)	-0.10	0.66
Base excess	91	19	1	71	100.0	71; 0	1.00 (.,. )	0.00	0.00
*Hospital stay data*:
LOS ICU	180	0	0	180	90.0	162; 18	0.89 (0.85–0.91)	-0.11	0.52
Ventilator days	180	0	0	180	98.3	177; 3	0.98 (0.97–0.99)	0.01	0.13
*Injury scoring data*:
ISS	180	0	0	180	87.2	157; 23	0.96 (0.94–0.97)	0.07	2.13
NISS	180	0	0	180	86.1	155; 25	0.96 (0.94–0.97)	0.26	2.58

Notes:
^aNumber of cases for registrations present in both NTR and EPRs;
^bObserved agreement calculated as number of concordant answers divided by n and multiplied by 100%;
^cConcordant answers – agreements over all paired answers for a given variable;
^dIntraclass correlation coefficient (two-way random effects model with absolute agreement);
^eMean difference calculated as EPRs minus NTR;
^fStandard deviation of the difference.
Abbreviations: NTR, Norwegian Trauma Registry; EPR, Electronic Patient Record; Conc., concordant answers; non-conc., non-concordant answers; ICC, intraclass correlation coefficient; CI, confidence interval; SD, standard deviation; SBP, Systolic Blood Pressure; RR, Respiratory Rate; LOS, Length of Stay; ICU, Intensive Care Unit; ISS, Injury Severity Score; NISS, New Injury Severity Score

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