Computationally challenging elgibility criteria.

The percentage of trials, broken down per trial set, that include at least one criterion only applying to a sub-population (sub-population) of the targeted patient cohort, that contain at least one laboratory value or medical score (labs and scores), that have at least one criterion that is temporally constrained (temporal), that have at least one criterion describing patient behavior or abilities (patient) and that have at least one of these four criteria (any).Computationally challenging elgibility criteria.