Figure 3: Comparing ROC curves of different clinical factors and HCV kinetic parameters for predicting SVR. π is the best predictor. BMI, body mass index; DM, diabetes mellitus; ALT, alanine aminotransferase; Log W0, logarithm of the baseline HCV RNA level; Log W1, logarithm of the HCV RNA level at week 1; Log W4, logarithm of the HCV RNA level at week 4; ε, logarithm of the HCV RNA level at week 1 divided by the baseline level, δ, logarithmic decline of the HCV RNA level; π, the ratio 1: α; α, trapezoidal area under the line between week 0 and week 1.