[simonh]

Trial data is kept confidential due to the risk that access to the data or information about it by research teams could influence or bias the design or conduct of further trials. This is routine in medical trials based on hard won lessons from previous problems due to biased trials and conflicts of interest.

It might seem shady if you don’t know the reasons for it (what are they hiding?). I understand that, but the fact is this is standard practice and releasing the raw data would be reckless and irresponsible.