Figure 2: The graph shows the HCV RNA kinetics one week after PEG-IFN + RBV treatment of chronic hepatitis C. The viral load at week 0 and week 1 is V0 and V1, respectively. W1=week 1. W0=week 0. α is the trapezoidal area under the line connecting (V0, W0) and (V1, W1), which is equal to {[(V0 – V1)(W1 – W0)]/2}+ V1(W1 – W0). π is the ratio 1: α.