Table 4.

Performance on gold standard corpus.

PHI Type	PHI sub-type	Count	# FNs	# FNs per 100,000 words	Per Category Recall	Per Category Precision
Name	Patient Name	54	0	0	1.00
	Patient Name Initial	2	2	0.598	0.00
	Relative/Proxy Name	175	4	1.195	0.977
	Clinician Name	593	3	1.494	0.995	0.725
Date	Date (not year)	482	26	7.769	0.946
	Year	46	11	3.287	0.761	0.713
Location		367	10	4.482	0.973	0.922
Phone		53	0	0	1.00	0.898
Age over 89		4	1	0.299	0.750	0.600
Undefined		3	2	0.598	0.333	N/A
Overall		1779	59	19.720	0.967	0.749

(FNs are false negatives and N/A indicates not applicable)