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

Table 2 Observed agreement, Cohen’s quadratic weighted Kappa and Gwet’s AC₂ for ordinal variables

Variable	Patients (n)	Number of missing registrations		Number of registrations^a	Observed agreement (%)^b	Kappa^c (95% CI)	AC₂ (95% CI)
Variable	Patients (n)	NTR	EPR	Number of registrations^a	Observed agreement (%)^b	Kappa^c (95% CI)	AC₂ (95% CI)
*Preinjury status data*:
Pre-injury GOS	180	0	1	179	98.3	-0.01 (-0.02-0.00)	0.98 (0.96-1.00)
Pre-injury ASA	180	0	0	180	97.9	0.77 (0.67–0.88)	0.96 (0.94–0.98)
*Prehospital data*:
Pre-hospital GCS	173	7	8	162	99.8	0.96 (0.91-1.00)	1.00 (0.99-1.00)
*Emergency admission data*:
In-hospital GCS	180	0	0	180	99.4	0.85 (0.60-1.00)	0.99 (0.98-1.00)
*Hospital stay data*:
Discharge GOS	180	0	4	176	98.7	0.77 (0.64–0.89)	0.97 (0.96–0.98)

Notes:
^aNumber of cases for registrations present in both NTR and EPRs;
^bQuadratic weighted observed agreement;
^cCohen’s quadratic weighted Kappa, the category “unknown” is excluded.
Abbreviations: NTR, Norwegian Trauma Registry; EPR, Electronic Patient Record; AC₂, Gwet’s second agreement coefficient; CI, confidence interval; GOS, Glasgow Outcome Score; ASA, American Society of Anesthesiologists physical status; GCS, Glasgow Coma Scale.

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