safety population - as dosed (even if dosed in wrong treatment arm), only patients included that received at least 1 dose of drug in the study
ITT population - as randomized (even if you did not start treatment or received the wrong treatment, or stopped treatment), all patients included that were randomized
Per protocol population - subset of ITT population that had no major protocol deviations (needs top be defined, e.g. by dosing compliance, met all IC/EC, completed double-blind treatmnent period or such things), patients excluded from PP population to be determined at blinded data review meeting before unblinding