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Related Concept Videos

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.
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Randomized Experiments01:13

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
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...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...

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Related Experiment Video

Updated: Jun 19, 2026

Clinical Efficacy of an Innovative Multidimensional Traction Therapy in Moderate Adolescent Idiopathic Scoliosis
07:12

Clinical Efficacy of an Innovative Multidimensional Traction Therapy in Moderate Adolescent Idiopathic Scoliosis

Published on: February 10, 2026

Practice misalignments in randomized controlled trials: Identification, impact, and potential solutions.

Katherine J Deans1, Peter C Minneci, Robert L Danner

  • 1Department of Surgery, The Children's Institute for Surgical Science, The Children's Hospital of Philadelphia, Abramson Research Center, Rm 1116, 34th St. and Civic Center Blvd., Philadelphia, PA 19104, USA. deansk@email.chop.edu

Anesthesia and Analgesia
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

Selecting appropriate control groups in randomized controlled trials (RCTs) is vital. Fixed-dose regimens in titrated therapy RCTs can create practice misalignments, affecting results and patient safety.

Related Experiment Videos

Last Updated: Jun 19, 2026

Clinical Efficacy of an Innovative Multidimensional Traction Therapy in Moderate Adolescent Idiopathic Scoliosis
07:12

Clinical Efficacy of an Innovative Multidimensional Traction Therapy in Moderate Adolescent Idiopathic Scoliosis

Published on: February 10, 2026

Area of Science:

  • Clinical Trials
  • Medical Practice
  • Research Methodology

Background:

  • Control group selection is crucial for interpretable and generalizable randomized controlled trial (RCT) results.
  • Challenges arise when control groups must reflect prevailing medical practices for routinely titrated therapies.
  • Fixed-dose randomization in titrated therapy trials may yield statistically significant but non-generalizable results.

Purpose of the Study:

  • To review how practice misalignments in RCTs affect safety, results, and conclusions.
  • To discuss methods for identifying relationships between therapy titration and patient characteristics.
  • To explore trial designs that minimize practice misalignments.

Main Methods:

  • Review of three recent randomized controlled trials (RCTs) involving titrated therapies.
  • Analysis of how fixed-dose randomization impacts clinical practice alignment.
  • Discussion of prospective methods and alternative trial designs.

Main Results:

  • Fixed-dose randomization disrupts the usual relationship between patient characteristics and therapy titration.
  • Misaligned subgroups within study arms may experience outcomes inconsistent with usual care.
  • Practice misalignments can compromise the safety, results, and conclusions of RCTs.

Conclusions:

  • Practice misalignments in RCTs, particularly with titrated therapies, pose risks to results' interpretability and generalizability.
  • Careful consideration of usual care and patient-specific factors is necessary when designing trials.
  • Alternative trial designs may mitigate misalignment risks but require thorough usual care characterization.