Estimated health care utilization of persons in care for HIV infection, by Ryan White Program funding status, King County Washington, southern Louisiana and Michigan, 1998.

RWP: Ryan White Program; SEM: standard error of the mean; CD4: CD4+ T-lymphocyte. *Number of tests per 6 months †Number of visits in study year ‡p≤.01 for ?2 comparing percentages of patients at RWP and non-RWP funded providers within study site. The p-value is for the overall test for difference and does not necessarily identify the specific levels of the variable that differ between RWP and non-RWP funded providers. §Number of days for those who were hospitalized during the study year. The number of patients in each calculation is: King County, RWP = 23, non-RWP = 16; MI, RWP = 37, non-RWP = 181. ∥NC: Not calculated. For Louisiana, RWP and non-RWP funded providers are not compared on the number of hospital days due to the very small number of patients (n = 3) at RWP supported providers who had been hospitalized during the study year.