Skip to main content

Table 2 Estimated power to detect multivitamin effects on CD4 count change over 18 months of follow-up (n=400)

From: Multivitamin supplementation in HIV infected adults initiating antiretroviral therapy in Uganda: the protocol for a randomized double blinded placebo controlled efficacy trial

Mean difference in CD4 change (δ, in cells/mm3) Standard deviation of CD4 counts at baseline and follow-up (σ1 = σ2, in cells/mm3)   Correlation of CD4 counts between baseline and follow-up (ρ)  
0.5 0.6 0.7
40 175 58 68 80
  225 39 47 59
50 175 77 86 94
  225 56 66 78
60 175 90 95 99
  225 72 81 90
70 175 97 99 >99
  225 84 91 97