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Calling a review blinded does not itself show that the information used is noncomparative. Participant treatment details, coded group results and pooled summaries create different access concerns and can influence people responsible for ongoing trial conduct.
Define the question and assumptions
Define the review purpose and required fields first. Relabelling arms A and B does not remove a between-group comparison. Establish separate access boundaries for data preparers, the reviewing committee and operational personnel. Make clear which decisions can be made using each level of information and which outputs may be communicated.
Hypothetical study example
In a hypothetical trial, an operational team is offered coded arm results without the treatment key. Even so, the direction of a difference could influence conduct. The team examines necessity and communicates only the limited information required to implement an authorised decision through a controlled channel.
Design review checks
- Classify explicitly whether each output contains comparative information between groups.
- Examine treatment clues arising from fields other than the formal code key.
- Prepare communication separating the review decision from operational implementation instructions.
Record the decision and its limits
An acceptance record shows who accessed each output and when. Document information content rather than relying on a blinded label. If an access incident occurs, assess its scope and possible influence on conduct. Faster decision making does not justify routine unnecessary result sharing; exceptions and remaining limitations should stay traceable.
Frequently asked questions
- Is a coded-arm comparison a blinded review?
- Codes may hide treatment names while comparative information remains available.
- Are pooled summaries always safe?
- No. Combined with other information, they may reveal clues about group results.