Table 4.

Results of the average-density identifier (family practice notes) human detection experiment by identifier type and reviewer

Test corpus				Reviewer #1 (abstractor)				Reviewer #3 (informaticist)				Both Reviewers Combined*
PHI type	N PHI instances	N residual PHI	Expected precision†	Predic-tions	Correct	Recall	Preci-sion	Predic-tions	Correct	Recall	Preci-sion	N predic-tions	N correct	Recall	Precis.
A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P
HIPAA
Pat. name	59	32	0.54	2	1	0.03	0.50	5	4	0.13	0.80	6	4	0.13	0.67
Date	228	34	0.15	0	0	0.00	0.00	8	2	0.06	0.25	8	2	0.06	0.25
ALL	287	66	0.23	2	1	0.02	0.50	13	6	0.09	0.46	14	6	0.09	0.43

^*Unduplicated count of N predictions and N correct across the two reviewers.

^†Defined as the number of residual PHI instances (col. C) divided by the total number of PHI instances (col. B).