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

Table 4 Intraclass correlation coefficient (ICC) for date and time 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
*Accident time*:
Trauma date^g	180	0	0	180	99.4	179; 1	1.000 (1.000–1.000)	-0.01	0.07
*Accident and injury related data*:
Injury date^h	180	0	7	173	87.9	152; 21	0.9973 (0.9963–0.9980)	2.82	21.92
*Prehospital data*:
Time scene arrival^h	173	12	13	158	88.6	140; 18	0.9992 (0.9989–0.9994)	-2.46	12.08
Time scene departure^h	173	14	14	156	90.4	141; 15	0.9984 (0.9979–0.9989)	0.20	17.30
*Emergency admission data*:
Hospital arrival^h	180	1	3	176	89.2	157; 19	1.0000 (1.0000–1.0000)	-0.01	2.07
Time until chest x-ray^h	154	13	13	139	95.7	133; 6	1.0000 (1.0000–1.0000)	-0.04	1.41
Time until pelvic x-ray^h	130	14	13	114	97.4	111; 3	1.0000 (1.0000–1.0000)	-0.15	1.51
Time until first CT^h	139	33	34	103	76.7	79; 24	0.9999 (0.9999-1.0000)	0.12	3.93

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;
^gDate variable was recalculated as the number of days after December 31, 2018;
^hTime variables with the same date in both NTR and EPRs were recalculated as minutes past midnight.
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; CT, Computer Tomography

ISSN: 1757-7241