In the letter to Hodge, written by Wollaston and signed by the Labour MP Valerie Vaz, the cross-party group wrote: "We are writing to you in your capacity as chair of the public accounts committee to ask if your committee would consider conducting an inquiry into the waste of NHS resources caused by the concealment of trial data for drugs, medical appliances and implants".
One unblinded sports physician (AW) coded the envelopes with A or B. To ensure concealment of allocation, data on allocation were stored in a secret location.
This included concealment of cardiac output data and the use of dummy infusions.
Areas in methodology requiring attention are allocation concealment (randomization blinding), blinding of data collectors and "discussion of Type II error in negative trials" [ 26].
By prominent members of the international climate science community whose "Climategate" e-mails purloined from the prestigious East Anglia University Climate Research Unit that exposed clear evidence of data manipulation, concealment of public records and exclusion of disagreeable research findings from influential publications.
The study was designed to be performed using optimised methodological resources such as an online randomisation system that ensures allocation concealment, intention-to-treat analysis of data and blinded adjudication of clinical events, in order to prevent systematic bias.
Study methods: design (eg, parallel design), randomisation method, method of allocation concealment, incomplete data, blinding, selective reporting and other sources of bias.
Overall, study quality was moderate; random sequence generation was adequate in 70% (23/33) of studies, allocation concealment in 58% (19/33), and blinding of data collection in 43% (14/33); one study was described as an open (unblinded) randomised controlled trial.
When asked for feedback on the proposed data release policy, one MalariaGEN researcher commented that "it's extremely difficult to judge the right point between excessive release of data and undue concealment from the international community" (PI Comments on Second draft Data Release Policy, 2006).
39 The overall risk of bias was moderate; the random sequence generation was adequate in 67% (2/3) of the studies, and allocation concealment in 67% (2/3); however, blinding of data collection (participants) was not possible in any of the studies due to the nature of the intervention, as well as with blinding of the outcomes except for one study.
All selected articles will be judged for their quality based on the Jadad score 31 in addition to an evaluation of allocation concealment and data analysis.
