Table 1.

Test set performance of labeling heuristic requiring multiple disease-specific code mentions compared to phenotype classifiers trained with data labeled using this multiple mentions approach

Phenotype	Prevalence of cases in test set	Multiple mentions of SNOMED code			APHRODITE classifier		Recall boost using classifier	Precision loss using classifier
		No. of mentions	Recall	Precision	Recall	Precision
Appendicitis	0.05	2	0.31	1.00	0.97	0.99	0.66	0.01
T2DM	0.14	4	0.24	0.99	0.60	0.91	0.36	0.08
Cataracts	0.17	4	0.07	0.97	0.63	0.93	0.56	0.04
HF	0.02	4	0.33	0.94	0.99	0.56	0.66	0.38
AAA	0.04	4	0.22	0.99	0.53	0.97	0.31	0.02
Epileptic seizure	0.02	4	0.06	1.00	0.22	0.94	0.17	0.06
PAD	0.05	4	0.18	0.98	0.91	0.91	0.72	0.07
Adult onset obesity	0.36	4	0.20	1.00	0.29	0.91	0.09	0.09
Glaucoma	0.01	4	0.08	1.00	0.22	0.88	0.14	0.12
VTE	0.01	4	0.03	1.00	0.69	0.22	0.66	0.78

Abbreviations: AAA, abdominal aortic aneurysm; HF, heart failure; T2DM, type 2 diabetes mellitus; PAD, peripheral arterial disease; VTE, venous thromboembolism.