| changes in survival after acquired immunodeficiency syndrome (aids): 1984-1991. | in a prospective cohort of 2,647 human immunodeficiency virus type 1 (hiv-1) seropositive homosexual men enrolled in baltimore, chicago, los angeles, and pittsburgh, 891 developed clinical acquired immunodeficiency syndrome (aids) between june 1984 and january 1992. cox proportional hazards models were used to examine temporal trends in survival after aids for specific diagnoses, controlling for level of immunosuppression at diagnosis, age, race, and geographic location. median survival time fol ... | 1993 | 7903022 |