Table 2

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

Guwatudde et al.

Guwatudde et al. BMC Infectious Diseases 2012 12:304   doi:10.1186/1471-2334-12-304

Open Data