Sensitivity and Specificity.

Sensitivity and specificity of the different algorithms after 8, 24 and 48 weeks of therapy using a cut-off GSS of 3. The sensitivity was defined as the proportion of TCEs with a GSS of 3 or more and a virological response on all those with a virological response whereas the specificity was seen as the proportion of TCEs with a GSS less than 3 and no virological response on all those with no virological response.