Table 2.

System performance and expert evaluation on the test set

Unstable angina/non-ST-segment elevation myocardial infarction		True positive	False positive	False negative	True negative	Total	Overall accuracy	κ Value	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Attainment rate by system	Attainment rate by gold standards
Measure 1	Early invasive approach by coronary angioplasty	264	33	78	252	627	0.823	0.65	0.77	0.88	0.889	0.76	0.48	0.55
Measure 3	ACE inhibitors/angiotensin receptor blockers before discharge (poor left ventricular ejection fraction)	48	1	2	22	73	0.958	0.91	0.96	0.96	0.980	0.92	0.67	0.68
Measure 4	Aspirin before discharge	474	2	5	24	505	0.986	0.87	0.99	0.92	0.996	0.83	0.94	0.95
Measure 5	β-blockers before discharge	296	1	6	185	488	0.986	0.97	0.98	0.99	0.997	0.97	0.61	0.62
Measure 6	Statin before discharge	167	0	7	340	514	0.986	0.97	0.96	1.00	1.000	0.98	0.32	0.34

Measures 7 and 8 are reported in the text.