TABLE 1.

Summary Results of the Cost of a Multisite Retention in HIV Care Intervention in the United States, Retention in Care Study, 2010–2012

	Intervention	SOC
Number of patients	615	613
Number and percentage of patients with 4-month visit constancy*	343 (55.8%)	280 (45.7%)
Number of additional patients retained in care beyond expected in SOC†	63	—
Total program cost per year, US$	241,565‡	—
Cost per patient in the intervention§	393	—
Cost per additional patient retained in care beyond expected in SOC‖	3834	—

^*Patient visit constancy defined as at least 1 kept primary care visit in each 4-month interval over 12 months.

^†Calculated by subtracting the number of SOC arm patients with 4-month visit constancy from intervention arm patients with 4-month constancy. The trial showed a relative improvement for the retention arm compared with the SOC arm to be 22.1%; 95% confidence interval: 9% to 36%; P < 0.01 (Gardner et al¹⁶).

^‡Total of itemized costs listed in Table 3. We collected additional costs associated with the EC-only intervention, and we did not collect the cost of SOC.

^§Calculated by dividing $241,565 by 615 patients in the intervention arm.

^‖Calculated by dividing $241,565 by 63 patients retained in care beyond expected in SOC arm.