Hospitalization rates for the top seven diagnostic categories prior to and over the first year following highly active antiretroviral therapy (HAART) initiation. (a) Virological responders. *Indicates P < 0.05 for the relative rate (RR) vs. days 1–45; hatched areas indicate the portion of AIDS-defining illnesses (ADIs) attributed to immune reconstitution inflammatory syndromes. (b) Nonresponders. #Indicates P between 0.05 and 0.15 for the RR vs. days 1–45; †indicates P < 0.05 for the RR vs. the 180 days prior to HAART initiation, which was used as the referent for cardiovascular admissions among nonresponders as there were no admissions for this group during days 1–45. Inf, infection; Psych, psychiatric; GI, gastrointestinal; CV, cardiovascular; End/Met, endocrine, nutritional, metabolic or immune.