Study cohort description.

For each screen, the total number of individuals examined is shown (Ntotal), in addition to any Crohn's disease cases (NCD_cases), non-Crohn's disease cases, which are a mix of individuals with Parkinson's disease, Schizophrenia, Type-2 Diabetes and Dystonia, (Nnon-CD_cases), and non-diseased controls (Ncontrols).bGenotypes available for only a subset of 31 replication markers.