Table 1.

Characteristics of the Sample: Hospital Ownership, Teaching Status, and Urban Population Size.

Site characteristic	% (n)
Hospital ownership (missing responses: 2)
Charitable	31.9 (58)
Public	54.4 (99)
Private	13.7 (25)
Teaching status (missing responses: 2)
Yes	86.3 (157)
No	13.7 (25)
Urban population (missing responses: 3)
<20 000	3.3 (6)
20 000-100 000	42.5 (77)
>100 000	54.1 (98)
Principal investigator at the site (missing responses: 0)
Yes	39.7 (73)
No	60.3 (111)