View source for Allocation concealment

In a [[randomized experiment]], '''allocation concealment''' hides the sorting of trial participants into treatment groups so that this knowledge cannot be exploited. Adequate allocation concealment serves to prevent study participants from influencing treatment allocations for subjects. Studies with poor allocation concealment (or none at all) are prone to [[selection bias]].<ref name="Forder-2005">{{Cite journal |vauthors=Forder PM, Gebski VJ, Keech AC | title = Allocation concealment and blinding: when ignorance is bliss | journal = Med J Aust | volume = 182 | issue = 2 | pages = 87–9 | year = 2005 | url = http://www.mja.com.au/public/issues/182_02_170105/for10877_fm.html | pmid = 15651970 | doi = 10.5694/j.1326-5377.2005.tb06584.x | s2cid = 202149 }}</ref>

Some standard methods of ensuring allocation concealment include sequentially numbered, opaque, sealed envelopes (SNOSE); sequentially numbered containers; pharmacy controlled randomization; and central randomization.<ref name="Schulz-2002">{{Cite journal|vauthors=Schulz KF, Grimes DA|year=2002|title=Allocation concealment in randomised trials: defending against deciphering|url=https://www.who.int/entity/rhl/LANCET_614-618.pdf|archive-url=https://wayback.archive-it.org/all/20120911210240/http://www.who.int/entity/rhl/LANCET_614-618.pdf|url-status=dead|archive-date=September 11, 2012|journal=Lancet|volume=359|issue=9306|pages=614–8|doi=10.1016/S0140-6736(02)07750-4|pmid=11867132|s2cid=12902486}}</ref> [[CONSORT]] guidelines recommend that allocation concealment methods be included in a study's [[Clinical trial protocol|protocol]], and that the allocation concealment methods be reported in detail in their publication; however, a 2005 study determined that most clinical trials have unclear allocation concealment in their protocols, in their publications, or both.<ref name="Pildal-2005">{{Cite journal |vauthors=Pildal J, Chan AW, Hróbjartsson A, Forfang E, Altman DG, Gøtzsche PC | title = Comparison of descriptions of allocation concealment in trial protocols and the published reports: cohort study | journal = BMJ | volume = 330 | issue = 7499 | page = 1049 | year = 2005 | doi = 10.1136/bmj.38414.422650.8F | url= | pmid = 15817527 | pmc = 557221 }}</ref> A 2008 study of 146 [[meta-analysis|meta-analyses]] concluded that the results of [[randomized controlled trials]] with inadequate or unclear allocation concealment tended to be biased toward beneficial effects only if the trials' outcomes were [[Subjectivity|subjective]] as opposed to [[Objectivity (philosophy)|objective]].<ref name="Wood-2008">{{Cite journal |vauthors=Wood L, Egger M, Gluud LL, Schulz KF, Jüni P, Altman DG, Gluud C, Martin RM, Wood AJ, Sterne JA | title = Empirical evidence of bias in treatment effect estimates in controlled trials with different interventions and outcomes: meta-epidemiological study | journal = BMJ | volume = 336 | issue = 7644 | pages = 601–5 | year = 2008 | doi = 10.1136/bmj.39465.451748.AD | url= | pmid = 18316340 | pmc = 2267990 }}</ref>

Allocation concealment is different from [[Blinded experiment|blinding]]. An allocation concealment method prevents influence on the randomization process, while blinding conceals the outcome of the randomization.<ref name="Forder-2005"/> However, allocation concealment may also be called "randomization blinding".

==Impact==
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Without the use of allocation concealment, researchers may (consciously or unconsciously) place subjects expected to have good outcomes in the treatment group, and those expected to have poor outcomes in the control group. This introduces considerable bias in favor of treatment.

==Naming==
Allocation concealment has also been called randomization blinding, blinded randomization, and bias-reducing allocation among other names. The term 'allocation concealment' was first introduced by Shultz et al. The authors justified the introduction of the term:

{{quote|“The reduction of bias in trials depends crucially upon preventing foreknowledge of treatment assignment. Concealing assignments until the point of allocation prevents foreknowledge, but that process has sometimes been confusingly referred to as 'randomization blinding'. This term, if used at all, has seldom been distinguished clearly from other forms of blinding (masking) and is unsatisfactory for at least three reasons. First, the rationale for generating comparison groups at random, including the steps taken to conceal the assignment schedule, is to eliminate selection bias. By contrast, other forms of blinding, used after the assignment of treatments, serve primarily to reduce ascertainment bias. Second, from a practical standpoint, concealing treatment assignment up to the point of allocation is always possible, regardless of the study topic, whereas blinding after allocation is not attainable in many instances, such as in trials conducted to compare surgical and medical treatments. Third, control of selection bias pertains to the trial as a whole, and thus to all outcomes being compared, whereas control of ascertainment bias may be accomplished successfully for some outcomes, but not for others. Thus, concealment up to the point of allocation of treatment and blinding after that point address different sources of bias and differ in their practicability. In light of those considerations, we refer to the former as 'allocation concealment' and reserve the term 'blinding' for measures taken to conceal group identity after allocation” <ref>{{cite journal |last1=Schulz |first1=KF |last2=Chalmers |first2=I |last3=Altman |first3=DG |last4=Grimes |first4=DA |last5=Moher |first5=D |last6=Hayes |first6=RJ |title='Allocation concealment': the evolution and adoption of a methodological term. |journal=Journal of the Royal Society of Medicine |date=June 2018 |volume=111 |issue=6 |pages=216–224 |doi=10.1177/0141076818776604 |pmid=29877772 |pmc=6022887 |url=http://researchonline.lshtm.ac.uk/4648090/3/Schulz-etal-2018-Allocation-concealment.pdf }}</ref>}}

==Subversion and fraud==
Traditionally, each patient's treatment allocation data was stored in a sealed envelopes, which was to be opened to determine treatment allocation. However, this system is prone to abuse. Reports of researchers opening envelopes prematurely or holding the envelopes up to lights to determine their contents has led some researchers to say that the use of sealed envelopes is no longer acceptable.<ref>{{cite journal |last1=Furberg |first1=CD |last2=Soliman |first2=EZ |title=Double-blindness protects scientific validity. |journal=Journal of Thrombosis and Haemostasis |date=February 2008 |volume=6 |issue=2 |pages=230–1 |doi= 10.1111/j.1538-7836.2008.02836.x|pmid=18021306 |language=en|doi-access=free }}</ref><ref>{{cite journal |last1=Torgerson |first1=DJ |last2=Roberts |first2=C |title=Understanding controlled trials. Randomisation methods: concealment. |journal=BMJ (Clinical Research Ed.) |date=7 August 1999 |volume=319 |issue=7206 |pages=375–6 |doi=10.1136/bmj.319.7206.375 |pmid=10435967 |pmc=1126995 |issn=0959-8138}}</ref> {{As of|2016}}, sealed envelopes were still in use in some clinical trials.<ref>{{cite journal |last1=Fava |first1=M. |last2=Johe |first2=K. |last3=Ereshefsky |first3=L. |last4=Gertsik |first4=L. G. |last5=English |first5=B. A. |last6=Bilello |first6=J. A. |last7=Thurmond |first7=L. M. |last8=Johnstone |first8=J. |last9=Dickerson |first9=B. C. |last10=Makris |first10=N. |last11=Hoeppner |first11=B. B. |last12=Flynn |first12=M. |last13=Mischoulon |first13=D. |last14=Kinrys |first14=G. |last15=Freeman |first15=M. P. |title=A Phase 1B, randomized, double blind, placebo controlled, multiple-dose escalation study of NSI-189 phosphate, a neurogenic compound, in depressed patients |journal=Molecular Psychiatry|volume=21 |issue=10 |pages=1372–1380 |doi=10.1038/mp.2015.178 |pmid=26643541 |pmc=5030464 |issn=1476-5578|year=2016 }}</ref>

Modern clinical trials often use centralized allocation concealment. Although considered more secure, central allocations are not completely immune from subversion. Typical and sometimes successful strategies include keeping a list of previous allocations (up to 15% of study personnel report keeping lists).<ref>{{Cite journal|last1=Kennedy|first1=Andrew D. M.|last2=Torgerson|first2=David J.|last3=Campbell|first3=Marion K.|last4=Grant|first4=Adrian M.|date=December 2017|title=Subversion of allocation concealment in a randomised controlled trial: a historical case study|journal=Trials|volume=18|issue=1|pages=204|doi=10.1186/s13063-017-1946-z|issn=1745-6215|pmc=5414185|pmid=28464922 |doi-access=free }}</ref>

==See also==
* [[Blinded experiment]]
* [[Design of experiments]]
* [[Randomized experiment]]
* [[Metascience]]
* [[Sealedenvelope.com]]—a provider of allocation concealment services

==References==
{{reflist}}

[[Category:Design of experiments]]
[[Category:Research]]
[[Category:Scientific misconduct]]
[[Category:Scientific method]]