Adjusted Models for Total Costs by Treatment Line and CD4 Cell Count.

ARV, antiretroviral; CI, confidence interval; HMO, health maintenance organization; POS, point of service; PPO, preferred provider organization.aModel additionally controlled for the degree to which patients were exposed to ARV prior to the index CD4 measurement (filled prescription for a third agent, exposed to backbone treatments but not third agent, no ARV exposure prior to index).bNo CD4 measurements occurred in patients with comprehensive care.cOther health plan includes basic/major medical, exclusive provider organization, consumer-directed health plan, and high-deductible health plan.