Which analysis is conducted only for the subset of the trial population who completed the study according to the protocol?

Per protocol analysis is the only type of analysis conducted exclusively on participants who completed the study according to the protocol. Intention-to-treat analysis includes all participants regardless of adherence to the protocol. Linear regression analysis is a statistical method used to examine relationships between variables and is not specific to completed studies. Equivalence trial analysis is a type of clinical trial design, not an analysis method. Therefore, the only analysis option that fits the given context is per protocol analysis.