Measuring agreement of administrative data with chart data using prevalence unadjusted and adjusted kappa

Table 3 Prevalence and reliability index between chart abstract and ICD-10 discharge abstract data for 3 select conditions, by sampling method

	Chart (+) p ₁, %	ICD10 (+) p ₂,%	Chart(+) ICD10(+) (a),%	Chart(-) ICD10(+) (b),%	Chart(+) ICD10(-) (c), %	Chart(-) ICD10(-) (d),%	Positive agreement	Negative agreement	PABAK	Kappa	(PABAK-kappa)	Observed agreement (I _o)	Chance agreement (I _e)
Random sample
Hypertension	30.19	22.13	20.61	1.52	9.58	68.29	0.79	0.92	0.78	0.72	0.06	0.89	0.61
Myocardial infarction	12.75	8.38	7.83	0.55	4.92	86.70	0.74	0.97	0.89	0.71	0.18	0.95	0.81
Congestive heart failure	8.33	6.34	5.71	0.62	2.62	91.04	0.78	0.98	0.94	0.76	0.18	0.97	0.86
Restricted sample ^#
Hypertension	78.51	78.77	73.36	5.42	5.15	16.07	0.93	0.75	0.78	0.69	0.09	0.89	0.66
Myocardial infarction	37.92	29.84	27.89	1.95	10.04	60.12	0.82	0.91	0.76	0.73	0.03	0.88	0.55
Congestive heart failure	25.58	22.56	20.34	2.22	5.24	72.20	0.85	0.95	0.85	0.80	0.05	0.93	0.63
Case-control sample ^$
Hypertension	52.20	50.00	46.56	3.44	5.64	44.36	0.91	0.91	0.82	0.82	0.00	0.91	0.50
Myocardial infarction	49.70	50.00	46.73	3.27	2.98	47.02	0.94	0.94	0.88	0.88	0.00	0.94	0.50
Congestive heart failure	45.47	50.00	45.08	4.92	0.39	49.61	0.94	0.95	0.89	0.89	0.00	0.95	0.50

#: The sample restricted to the condition of hypertension, myocardial infarction, and congestive heart failure
$: Condition chosen first, with random selection of controls without the condition of interest.

ISSN: 1471-2288