Table 1.

Rule characteristics and training set performance for VA Disability exams. The “i” and “r” refer to initial and review post traumatic stress disorder exams. The number of rules, concepts (conc), exploded concepts (conc exp) and strings or patterns (str ptrn) for each exam are shown in columns 3–6.

Exam	Doc Count	Rule	conc	conc exp	str ptrn	TP	TN	FP	FN	sen	sp	p-lr	ppv	npv
Audio	147	7	37	13,810	67	973	5	3	48	95%	63%	254%	100%	9%
Eye	143	7	43	41,977	67	856	31	20	94	90%	61%	230%	98%	25%
Feet	143	10	83	41,296	244	1,013	90	47	110	90%	66%	263%	96%	45%
GenM	145	10	145	118,047	296	1,110	115	81	245	82%	59%	198%	93%	32%
iPTSD	145	10	118	14,943	199	1,102	61	36	251	81%	63%	219%	97%	20%
Joints	142	10	92	38,338	250	1,026	90	45	119	90%	67%	269%	96%	43%
Mental	144	10	119	18,456	335	1,090	66	42	232	82%	61%	212%	96%	22%
rPTSD	147	10	136	46,169	374	1,147	66	49	208	85%	57%	199%	96%	24%
Skin	144	10	55	39,458	157	860	47	40	113	88%	54%	192%	96%	29%
Spine	146	11	74	23,681	214	989	63	41	106	90%	61%	229%	96%	37%
Total	1446	95	902	396,175	2203	10,166	634	404	1526	87%	61%	223%	96%	29%