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Table 2 Key strategies to ensure intervention fidelity and reduce contamination

From: Sunset Without AIDS: protocol for a randomized controlled trial of a brief video-based intervention to improve the ability of AIDS prevention in elderly men

- Increased sample size up to 10%
- The study group will discuss the types, scope and measures of reducing possible contamination sources through discussion and literature review
- Training of trial staff and health workers to emphasize the effects of contamination. How to avoid it, how to use unbiased explanations to solve the problem
- Different intervention groups will be delivered in separate areas
- Intervention videos are kept by designated personnel and not available through other channels
- Information packs with Sunset Without AIDS materials are clearly labeled and stored separately from normal video groups’ materials
- Level and extent of participants reported contamination are measured at follow-up visits
- Participants will be escorted before grouping and between survey locations
- Field study team members confirm that trial participants only receive the specified intervention
- Participants are randomly assigned to different groups by selecting envelopes
- The data analysts are blinded to the allocation
- Ensure that the educational content and duration of the video downloaded from the website of the Chinese CDC is the same as that of Sunset Without AIDS
- Lecture group will be conduct by an AIDS expert for the same amount of time and content as the intervention group
- Intervention sessions audio recorded, and 10% reviewed centrally [23]
- All trial investigators will remain blinded