Table 1.

Agreement between the initial and each external coder for the four most frequently selected diagnoses

		Initial versus external coder 1		Initial versus external coder 2
	Number	Kappa	95% CI	Kappa	95% CI
J960, acute respiratory failure	78	0.26	0.06–0.46	0.25	0.06–0.43
J159, bacterial pneumonia, unspecified	31	0.49	0.22–0.76	0.26	0.03–0.56
I10, essential hypertension	25	0.52	0.25–0.79	0.26	0.06–0.59
I501, left ventricular failure	22	0.50	0.18–0.81	0.46	0.10–0.82

CI, confidence interval.