HR (95%CI) P HR 95%CI 1 Pa
Sex Male vs. female 0.709 (0.414-1.320) 0.307    
Age >40 years  vs. <40 years 1.25 (.733-2.125) 0.414    
IDU vs. other transmission group 1.23 (0.640-2.38) 0.540    
cART starting year 2004-2005 vs. 2006-2009 1.860 (1.066-3.247) 0.029 1.807 (1.028-3.176) 0.040
HCV and/or HBV-coinfection vs. HIV monoinfection 1.976 (1.174-3.328) 0.010 1.608 (0.924-2.797) 0.093
CD4+ cell count <200/mm3  vs. >200/mm3 1.342 (0.782-2.302 0.285    
HIV RNA >100.000 cop/ml  vs. <100.000 cop/ml 0.832 (0.489-1.413) 0.496    
TDF + 3TC/FTC backbone 0.613 (0.362-1.037) 0.068    
ABC + 3TC backbone 1.290 (0.630-2.650) 0.481    
PI vs. NNRTI-based starting regimen 2.118 (1.187-3.779) 0.011 1.893 (0.1029-3.485) 0.040
1. A Cox regression analysis, using a step-forward selection method, was performed to indentify variables associated to treatment outcome. Variables with a P value ≤ 0.1 are retained in the regression equation. Relative risks are expressed as hazard ratios (HR) and 95% confidence intervals (CI)
ABC, abacavir; AZT, zidovudine; cART: combined antiretroviral treatment; ddI. didanosine; d4T. Stavudine; FTC, Emtricitabine; IDU, intravenous drug user; 3TC, lamivudine; NNRTI, non-nucleosida reverse transcriptase inhibitor; R, ritonavir-boosted; PI, protease inhibitor; TDF, tenofovir
Table 4: Variables associated with treatment failure as assessed by Cox proportional hazards regression analysis.
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