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Related Concept Videos

Strategies for Assessing and Addressing Confounding01:25

Strategies for Assessing and Addressing Confounding

Confounding is a critical issue in epidemiological studies, often leading to misleading conclusions about associations between exposures and outcomes. It occurs when the relationship between the exposure and the outcome is mixed with the effects of other factors that influence the outcome. Given that, addressing confounding is of high importance for drawing accurate inferences in research.
Confounding can be addressed at both the design phase of a study and through analytical methods after data...
Blinding01:11

Blinding

Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
Understanding Deception01:14

Understanding Deception

Deception is a pervasive aspect of human communication. Empirical studies have shown that most individuals engage in some form of deceit on a daily basis, with approximately 20% of social exchanges involving deceptive elements. Lying follows a developmental trajectory, peaking during adolescence and declining with age, possibly due to the maturation of cognitive control and social accountability.Cognitive and Social Factors in Deception DetectionDespite its prevalence, accurately detecting...
Confounding in Epidemiological Studies01:27

Confounding in Epidemiological Studies

Confounding in statistical epidemiology represents a pivotal challenge, referring to the distortion in the perceived relationship between an exposure and an outcome due to the presence of a third variable, known as a confounder. This variable is associated with both the exposure and the outcome but is not a direct link in their causal chain. Its presence can lead to erroneous interpretations of the exposure's effect, either exaggerating or underestimating the true association. This phenomenon...
Impression Management Techniques IV: Altercasting01:14

Impression Management Techniques IV: Altercasting

Altercasting is a strategic communication technique in which an individual imposes a specific identity or social role onto another person to influence their behavior and shape the interaction. By presuming a role—such as “responsible leader” or “patient person”—altercasting encourages the target to conform to that identity, often aligning their behavior with the expectations associated with the role. The power of this tactic lies in its subtlety; once a role is assigned, it becomes socially...
Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

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Related Experiment Video

Updated: May 11, 2026

An Experimental Analysis of Children's Ability to Provide a False Report about a Crime
07:36

An Experimental Analysis of Children's Ability to Provide a False Report about a Crime

Published on: May 3, 2016

Allocation concealment: a methodological review.

Laura Clark1, Ulrike Schmidt, Puvan Tharmanathan

  • 1York Trials Unit, Department of Health Sciences, University of York, York, UK. laura.clark@york.ac.uk

Journal of Evaluation in Clinical Practice
|May 8, 2013
PubMed
Summary
This summary is machine-generated.

Accurate reporting of trial methods, specifically allocation concealment, is crucial for reliable research. This review found many trials lacked adequate allocation concealment, potentially biasing results.

Keywords:
allocation concealmentmeta-regressionmethodological reviewrandomized controlled trials (RCTs)

Related Experiment Videos

Last Updated: May 11, 2026

An Experimental Analysis of Children's Ability to Provide a False Report about a Crime
07:36

An Experimental Analysis of Children's Ability to Provide a False Report about a Crime

Published on: May 3, 2016

Area of Science:

  • Clinical Trials Methodology
  • Research Integrity
  • Evidence-Based Medicine

Background:

  • Accurate reporting of trial methodology and results is vital for assessing research quality.
  • Allocation concealment is a critical aspect of methodology that can influence treatment effect estimates.

Purpose of the Study:

  • To assess the impact of adequate allocation concealment on treatment effect estimates.
  • To evaluate the reporting standards of allocation concealment in randomized controlled trials.

Main Methods:

  • A systematic search of MEDLINE was conducted for randomized controlled trials (RCTs) indexed in January 2011.
  • Meta-regression analysis was performed on two-arm trials to quantify the association between allocation concealment adequacy and effect size.

Main Results:

  • Only 27% of included trials reported adequate allocation concealment.
  • Insufficient information to judge allocation concealment was present in 68% of trials.
  • A non-statistically significant trend suggested smaller effect sizes with adequate allocation concealment.

Conclusions:

  • A significant proportion of trials exhibit poor or inadequately reported allocation concealment.
  • There is a need for higher reporting standards in clinical trial methodology.
  • Inadequate allocation concealment may introduce bias into treatment effect estimates.