Figure 4.

Health information exchange (HIE) access rate by site. The figure shows rates of HIE access with 95% CIs for new and return visits, and associated logon activity for each site. Physician and nurse/clerk logon activity are shown separately. For each site, we list the total number of new and return visits, as well as the numbers of doctors and nurses/clerks who had access. Safety net sites are denoted by *. ED, emergency department.