Blinding

Birch S. A review and analysis of placebo treatments, placebo effects, and placebo controls in trials of medical procedures when sham is not inert. J Altern Complement Med 2006; 12(3):303-310.
PMID: 16646730 

Boutron I, Estellat C, Ravaud P. A review of blinding in randomized controlled trials found results inconsistent and questionable. J Clin Epidemiol 2005; 58(12):1220-1226.
PMID: 16291465 

Boutron I, Estellat C, Guittet L, Dechartres A, Sackett DL, Hrobjartsson A, Ravaud P. Methods of blinding in reports of randomized controlled trials assessing pharmacologic treatments: a systematic review. PLoS Med 2006; 3(10)
PMID: 17076559 

Bridgman S, Engebretsen L, Dainty K, Kirkley A, Maffulli N. Practical aspects of randomization and blinding in randomized clinical trials. Arthroscopy 2003; 19(9):1000-1006.
PMID: 14608321

Chan AW, Altman DG. Epidemiology and reporting of randomised trials published in PubMed journals. Lancet 2005; 365(9465):1159-1162.
PMID: 15794971

Cheng K, Smyth RL, Motley J, O'Hea U, Ashby D. Randomized controlled trials in cystic fibrosis (1966-1997) categorized by time, design, and intervention. Pediatr Pulmonol 2000; 29(1):1-7.
PMID: 10613779 

Clark HD, Wells GA, Huet C, McAlister FA, Salmi LR, Fergusson D, Laupacis A. Assessing the quality of randomized trials: reliability of the Jadad scale. Control Clin Trials 1999; 20(5):448-452.
PMID: 10503804

Crow R, Gage H, Hampson S, Hart J, Kimber A, Thomas H. The role of expectancies in the placebo effect and their use in the delivery of health care: a systematic review. Health Technol Assess 1999; 3(3):1-96.
PMID: 10448203 

Day SJ, Altman DG. Statistics notes: blinding in clinical trials and other studies. BMJ 2000; 321(7259):504.
PMID: 10948038 

Desbiens NA. Lessons learned from attempts to establish the blind in placebo-controlled trials of zinc for the common cold. Ann Intern Med 2000; 133(4):302-303.
PMID: 10929173

Devereaux PJ, Choi PT, El Dika S, Bhandari M, Montori VM, Schunemann HJ, Garg AX, Busse JW, Heels-Ansdell D, Ghali WA, Manns BJ, Guyatt GH. An observational study found that authors of randomized controlled trials frequently use concealment of randomization and blinding, despite the failure to report these methods. J Clin Epidemiol 2004; 57(12):1232-1236.
PMID: 15617948 

Devereaux PJ, Manns BJ, Ghali WA, Quan H, Lacchetti C, Montori VM, Bhandari M, Guyatt GH. Physician interpretations and textbook definitions of blinding terminology in randomized controlled trials. JAMA 2001; 285(15):2000-2003.
PMID: 11308438 

Falagas ME, Pitsouni EI, Bliziotis IA. Trends in the methodological quality of published randomized controlled trials on antibacterial agents. Br J Clin Pharmacol 2008; 65(6):942-954.
PMID: 18279480  [New]

Fergusson D, Glass KC, Waring D, Shapiro S. Turning a blind eye: the success of blinding reported in a random sample of randomised, placebo controlled trials. BMJ 2004; 328(7437):432.
PMID: 14761905

Gøtzsche PC. Blinding during data analysis and writing of manuscripts. Control Clin Trials 1996; 17(4):285-290.
PMID: 8889343 

Gøtzsche PC. Methodology and overt and hidden bias in reports of 196 double-blind trials of nonsteroidal anti-inflammatory drugs in rheumatoid arthritis. Control Clin Trials 1989; 10(1):31-56.
PMID: 2702836

Hemila H. Allocation concealment and blinding: when ignorance is bliss. Med J Aust 2005; 183(3):165-166.
PMID: 16175687 

Hrobjartsson A, Gøtzsche PC. [What is the effect of placebo interventions? A systematic review of randomized clinical trials with placebo treated and untreated patients]. Ugeskr Laeger 2002; 164(3):329-333.
PMID: 11816328 

Hrobjartsson A, Forfang E, Haahr M, ls-Nielsen B, Brorson S. Blinded trials taken to the test: an analysis of randomized clinical trials that report tests for the success of blinding. Int J Epidemiol 2007; 36(3):654-663.
PMID: 17440024 

Hrobjartsson A, Gotzsche PC. Is the placebo powerless? An analysis of clinical trials comparing placebo with no treatment. N Engl J Med 2001; 344(21):1594-1602.
PMID: 11372012 

Hrobjartsson A, Gøtzsche PC. Is the placebo powerless? Update of a systematic review with 52 new randomized trials comparing placebo with no treatment. J Intern Med 2004; 256(2):91-100.
PMID: 15257721 

Hrobjartsson A, Gøtzsche PC. Placebo interventions for all clinical conditions. Cochrane Database Syst Rev 2004;(3):CD003974.
PMID: 15266510 

Jadad AR, Moore RA, Carroll D, Jenkinson C, Reynolds DJ, Gavaghan DJ, Mcquay HJ. Assessing the quality of reports of randomized clinical trials: is blinding necessary? Control Clin Trials 1996; 17(1):1-12.
PMID: 8721797

Kemler MA, de Vet HC. Does randomization introduce bias in unblinded trials? Epidemiology 2000; 11(2):228.
PMID: 11021625

Kemmler G, Hummer M, Widschwendter C, Fleischhacker WW. Dropout rates in placebo-controlled and active-control clinical trials of antipsychotic drugs: a meta-analysis. Arch Gen Psychiatry 2005; 62(12):1305-1312.
PMID: 16330718 

Kjaergard LL, Nikolova D, Gluud C. Randomized clinical trials in HEPATOLOGY: predictors of quality. Hepatology 1999; 30(5):1134-1138.
PMID: 10534332 

Lang T. Masking or blinding? An unscientific survey of mostly medical journal editors on the great debate. MedGenMed 2000; 2(1):E25.
PMID: 11104471 

Lee S, Walker JR, Jakul L, Sexton K. Does elimination of placebo responders in a placebo run-in increase the treatment effect in randomized clinical trials? A meta-analytic evaluation. Depress Anxiety 2004; 19(1):10-19.
PMID: 14978780 

Montori VM, Bhandari M, Devereaux PJ, Manns BJ, Ghali WA, Guyatt GH. In the dark: the reporting of blinding status in randomized controlled trials. J Clin Epidemiol 2002; 55(8):787-790.
PMID: 12384193 

Noseworthy JH, Ebers GC, Vandervoort MK, Farquhar RE, Yetisir E, Roberts R. The impact of blinding on the results of a randomized, placebo-controlled multiple sclerosis clinical trial. Neurology 1994; 44(1):16-20.
PMID: 8290055 

Poolman RW, Struijs PA, Krips R, Sierevelt IN, Marti RK, Farrokhyar F, Bhandari M. Reporting of outcomes in orthopaedic randomized trials: does blinding of outcome assessors matter? J Bone Joint Surg Am 2007; 89(3):550-558.
PMID: 17332104

Quitkin FM, Rabkin JG, Gerald J, Davis JM, Klein DF. Validity of clinical trials of antidepressants. Am J Psychiatry 2000; 157(3):327-337.
PMID: 10698806 

Rees JR, Wade TJ, Levy DA, Colford JM, Jr., Hilton JF. Changes in beliefs identify unblinding in randomized controlled trials: a method to meet CONSORT guidelines. Contemp Clin Trials 2005; 26(1):25-37.
PMID: 15837450

Sackett DL. Commentary: Measuring the success of blinding in RCTs: don't, must, can't or needn't? Int J Epidemiol 2007; 36(3):664-665.
PMID: 17675306 

Schulz KF. Assessing allocation concealment and blinding in randomized controlled trials: why bother? ACP J Club 2000; 132(2):A11-A12.
PMID: 10750446

Schulz KF. Assessing allocation concealment and blinding in randomised controlled trials: why bother? Evid Based Nurs 2001; 4(1):4-6.
PMID: 11707879

Schulz KF. Assessing allocation concealment and blinding in randomised controlled trials: why bother? Equine Vet J 2005; 37(5):394-395.
PMID: 16163939

Schulz KF, Grimes DA, Altman DG, Hayes RJ. Blinding and exclusions after allocation in randomised controlled trials: survey of published parallel group trials in obstetrics and gynaecology. BMJ 1996; 312(7033):742-744.
PMID: 8605459 

Schulz KF, Chalmers I, Hayes RJ, Altman DG. Empirical evidence of bias. Dimensions of methodological quality associated with estimates of treatment effects in controlled trials. JAMA 1995; 273(5):408-412.
PMID: 7823387 

White AR, Filshie J, Cummings TM. Clinical trials of acupuncture: consensus recommendations for optimal treatment, sham controls and blinding. Complement Ther Med 2001; 9(4):237-245.
PMID: 12184353 

 

Page last edited: 06 May 2009