Method       Variable               SD       P-Value         VA log(AST) -0.269 0.160 0.093   log(albumin) 5.128 0.413 <0.001   age 0.017 0.008 0.035   log(protime) 1.766          0.474 < 0.001         EL log(AST) 0.342 0.145 0.018   log(albumin) 4.737          0.436 < 0.001   age 0.016 0.007 0.027   log(protime) 2.112 0.435 < 0.001

Table 3: AFT model analysis of PBC data using validation set and estimated likelihood methods using the exponential regression model.