title: Influence of age at infection on human immunodeficiency virus disease progression to different clinical endpoints: the SEROCO cohort (1988-1994). The Seroco Study Group.
abstract: METHODS
  The influence of age at infection on progression of human immunodeficiency virus (HIV) disease to different clinical endpoints was studied among 393 HIV-seropositive adults selected from the French SEROCO cohort; follow-up lasted from January 1988 to November 1994. Selected patients had a known date of infection and were enrolled shortly after seroconversion. Age-associated risk ratios (RR) were estimated using the Cox model (age fitted as a continuous variable and RR expressed for each 10-year increment after adjustment for symptomatic primary infection and sexual preference).
  
  
  RESULTS
  Age had a weak influence on progression from the date of infection to the first category B event (crude RR = 1.15; adjusted RR = 1.09; 95% confidence interval [CI]: 0.89-1.36) but a marked influence on progression from the first category B to the first category C event (crude RR = 1.95; adjusted RR = 1.97; 95% CI: 1.37-2.79). Similar results were obtained after adjustment for the CD4+ cell count at enrollment. A qualitative CD4+ cell defect could explain the influence of age, but this remains to be confirmed.
  
  
  CONCLUSIONS
  Age at infection should be included in the definition of CD4+ cell count thresholds for clinical management and treatment initiation. Risk factors for progression should be assessed according to the different clinical endpoints.
authors.affiliation: Unité INSERM U-292 & Service d'épidémiologie, Hôpital du Kremlin-Bicêtre, France.
authors.forename: F
authors.initials: F
authors.lastname: Belanger
authors.forename: L
authors.initials: L
authors.lastname: Meyer
authors.forename: N
authors.initials: N
authors.lastname: Carré
authors.forename: A
authors.initials: A
authors.lastname: Coutellier
authors.forename: C
authors.initials: C
authors.lastname: Deveau
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000375:Aging / Q000502:physiology*; D018791:CD4 Lymphocyte Count; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D005602:France / Q000453:epidemiology; D015658:HIV Infections / Q000453:epidemiology / Q000503:physiopathology*; D006679:HIV Seropositivity / Q000453:epidemiology / Q000503:physiopathology*; D015497:HIV-1; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016016:Proportional Hazards Models; D012307:Risk Factors