Treatment fidelity refers to

• A. The implementation cost of the intervention
• B. The strategies that monitor and enhance the accuracy and consistency of an intervention to ensure it is implemented as planned and that each component is delivered in a comparable manner to all study participants over time
• C. Participant satisfaction with the intervention
• D. The recruitment rate of participants

Answer: (B)

Treatment fidelity is about delivering an intervention as it was designed. It focuses on monitoring and supporting the accuracy and consistency of the intervention so that each component is implemented according to the plan and delivered in a comparable way to all participants over time. This ensures that any observed effects (or lack thereof) can be attributed to the intervention itself rather than to variations in how it was carried out. Fidelity covers how closely the protocol is followed, the dose or amount of intervention delivered, the quality of delivery, and consistency across participants and settings.

The other options refer to different study aspects: cost of implementing the intervention, participant satisfaction, and how quickly participants are recruited. These are important considerations, but they do not define fidelity, which is specifically about faithful and consistent implementation of the planned intervention.