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Table 2 Cox proportional hazards regression analysis for time to first morbidity (OI) or mortality event

From: No differences in clinical outcomes with the addition of viral load testing to CD4 cell count monitoring among HIV infected participants receiving ART in rural Uganda: Long-term results from the Home Based AIDS Care Project

Arm # people # Events Person years Rate per 100 person years Hazard Ratio (95 % CI) a p_value
Original Viral load and CD4 arms
Viral load arm 395 49 1617.3 3.03 ref.  
CD4 arm 388 53 1607.7 3.30 1.22( 0.82 to 1.84) 0.327
Re-randomized from Clinical arm
Viral load arm 165 8 313.3 2.55 ref.  
CD4 arm 166 9 314.1 2.87 1.14( 0.42 to 3.10) 0.801
All combined
Viral load arm 560 57 1930.6 2.95 ref.  
CD4 arm 554 62 1921.9 3.23 1.19( 0.82 to 1.73) 0.368
  1. aAdjusted for Age, sex, baseline CD4, Viral load and BMI