Table 1.

Glossary of risk stratification terms [49]

Sensitivity (true positive rate) proportion of individuals with metachronous advanced neoplasia at follow-up who was classified as ‘high risk’ at baseline by classification strategy (i.e., predictive model or guidelines)

Specificity (true negative rate) proportion of individuals without metachronous advanced neoplasia at follow-up who was classified as ‘low risk’ at baseline by classification strategy

Positive predictive value (PPV) proportion of individuals with metachronous advanced neoplasia at follow-up among those who were classified by a strategy as ‘high risk’ at baseline

Negative predictive value (NPV) proportion of individuals without metachronous advanced neoplasia at follow-up among those who were classified by a strategy as ‘low risk’ at baseline

Surveillance colonoscopy overuse rate (1-PPV) proportion of individuals without metachronous advanced neoplasia at follow-up among those who were classified by a strategy as ‘high risk’ at baseline

Surveillance colonoscopy underuse rate (1-NPV) proportion of individuals with metachronous advanced neoplasia at follow-up among those who were classified by a strategy as ‘low risk’ at baseline