On-treatment predictions of success in peg-interferon/ribavirin treatment using a novel formula

Table 4 Positive and negative predictive values calculated by the formula constructed with data at week 48

Cut-off point	PPV (%)	NPV (%)	P value
0.2	65.9	100	< 0.00001
0.3	66.7	96.7	< 0.00001
0.4	66.7	86.1	< 0.00001
0.5	68.8	82.5	0.000013
0.6	71.4	79.5	0.000024
0.7	77.3	76.0	0.000048
0.8	80.0	70.2	0.00074

The calculated value was applied to the cut-off points and the numbers of patients with sustained virological response were evaluated.