Enhancing Efficiency and Decision Quality in Parkinson’s Disease Drug Trials for LRRK2 Programs Using Item Response Modelling PAGE 29 (2021) Abstr 9857. Ibrahim MMA, Plan EL, Jönsson S, Chen C, Karlsson MO. CNSConferenceMIDDPharmacometricsTrial design and analysis Pharmetheus Affiliates Chief Business Development Officer & Deputy CEO Elodie Plan See bio Senior Consultant, R&D Scientist Siv Jönsson See bio Scientific Advisor & Board Member Mats Karlsson See bio