- aData are from Table 5 in Haahr MT, Hróbjartsson A. Who is blinded in randomized clinical trials? A study of 200 trials and a survey of authors. Clin Trials 2006;3(4):360-5
- bData are from the table in Devereaux PJ, Manns BJ, Ghali WA, et al. Physician interpretations and textbook definitions of blinding terminology in randomized controlled trials. JAMA. 2001;285:2000-3. Of 17 unique group combinations, 9 are shown. Presumably, the remaining 8 combinations included “other groups” thought to be blinded (e.g., laboratory technicians, pharmacists)
- cIn this study of 83 “double-blind” trials, 49% (41) did not indicate which groups were blinded. Data are from Table 2 in Montori VM, Bhandari M, Devereaux PJ, et al. In the dark: the reporting of blinding status in randomized controlled trials. J Clin Epidemiol 2002;55:787-790
- dData are from Table 1 in Viergever RF, Ghersi D. Information on blinding in registered records of clinical trials. Trials 2012 Nov 15;13:210