Proportion of gonorrhea/chlamydia tests that were accompanied by a syphilis test.
Note. The data are for encounters (January 1, 1996, to November 22, 2000) at a large, urban, public hospital in Marion County, Ind, and are divided by calendar quarter and by patients’ gender (pregnant women are excluded). The vertical dotted lines divide the study into the preoutbreak period (January 1, 1996, to March 31, 1998), the preintervention outbreak period (April 1, 1998, to February 28, 1999), and the intervention period (March 1, 1999, to November 22, 2000).