Table 1. Hospital characteristics and results of two approaches for DSD case ascertainment at three children’s hospitals.

	Hospital A	Hospital B	Hospital C
Hospital Characteristics
Hospital beds	300	254	245
Inpatient admissions	9,000	14,000	11,000
Surgical procedures	10,000	15,000	17,000
Traditional Approach
Cases initially identified	NP	30	16
Final chart review
Uncertain eligibility	NP	2	1
Not eligible	NP	0	1
Confirmed eligible	NP	28	14
Informatics Approach *
ICD-9 cases	737	2,868	3,557
ICD-9 cases + text matches	728	2,742	2,550
Initial chart review	81	153	260
Final chart review
Uncertain eligibility	6	13	18
Not eligible	16	63	16
Confirmed eligible	59	77	226

NP  =  not performed.

*At Hospital A, all cases were reviewed using the search engine EMERSE and it was not necessary to run a database query for keyword matching.