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Table 3 Estimated power to detect multivitamin effects on weight 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 weight change (δ, in kg) Standard deviation of weight at baseline and follow-up (σ1 = σ2, in cells/mm3)   Correlation of weight between baseline and follow-up (ρ)  
0.5 0.6 0.7
2 9 56 66 78
  11 41 49 61
2.5 9 75 88 96
  11 58 74 86
3 9 88 94 98
  11 74 82 92
3.5 9 96 98 >99
  11 86 92 97