Matched Control
Matched Control - Related Videos
01:17
Sign Test for Matched Pairs
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2025
The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values. To conduct the sign test, we first calculate the differences in value between...
08:06
Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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Cited by 4 •
2018
This protocol describes a method for investigating the possibility of metamemory, or memory awareness, in rodents. The odor-based delayed-matching-to-sample paradigm is a novel, ecologically-relevant behavioral test useful for determining the extent to which rodents can adaptively respond based on cognitively monitoring the strength of their memory states.
01:09
Wilcoxon Signed-Ranks Test for Matched Pairs
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2025
The Wilcoxon signed-rank test for matched pairs evaluates the null hypothesis by combining the ranks of differences with their signs. It essentially tests whether the median of the differences in a population of matched pairs is zero. Since the test incorporates more information than the sign test, it generally yields more trustable conclusions. This test also does not require the data to follow a normal distribution, but two conditions must be met for it to be applicable: (1) the data must...
09:54
Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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Cited by 6 •
2018
This protocol describes the fabrication of microfluidic devices from MY133-V2000 to eliminate artifacts that often arise in microchannels due to the mismatching refractive indices between microchannel structures and an aqueous solution. This protocol uses an acrylic holder to compress the encapsulated device, improving adhesion both chemically and mechanically.
08:31
Effects of Thinking Abstractly or Concretely on Self-control
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2023
Source: Diego Reinero & Jay Van Bavel—New York University Whether it's refraining from having a second serving of ice cream, studying instead of attending a fun party, or deciding to put money away in a savings account, sacrificing short-term outcomes in favor of long-term outcomes (i.e., delaying gratification) is a central tenant of self-control. When people apply self control, they engage numerous psychological processes to help them achieve their goal. These self-regulatory processes...
FAQs
Matching reduces confounding by making the comparison groups similar for characteristics that could independently affect the outcome. If age, sex, disease severity, or exposure history are balanced, an observed difference is less likely to reflect those factors rather than the intervention or disease condition. This strengthens the study’s ability to attribute outcome differences to the factor being investigated.
Researchers may match controls on age, sex, disease severity, and exposure history when these characteristics could influence study results. The appropriate factors depend on the medical question and the groups being compared. Matching these variables helps create a more informative comparison, because differences in outcomes can be assessed with less influence from the selected characteristics.
Matched controls provide a structured comparison when researchers cannot assign participants randomly to study groups. By selecting comparison participants or groups with relevant characteristics in common, investigators can reduce some sources of confounding in clinical trials, case-control studies, and observational medicine. This approach supports more reliable estimates of treatment effects, risk factors, or disease associations.
A study first identifies characteristics that could influence its results, such as age, sex, disease severity, or exposure history. Researchers then select a comparison participant or group with similar values for those factors and compare outcomes between the matched groups. The resulting comparison is interpreted in relation to the intervention, condition, risk factor, or disease association under study.
Matched controls are used across clinical trials, case-control studies, and observational medicine. In each setting, they help investigators construct a comparison that accounts for selected participant or group characteristics. Their role is especially relevant when researchers need to estimate treatment effects, examine risk factors, or evaluate disease associations without relying solely on random assignment.
Comparisons with matched controls can support estimates of treatment effects, risk factors, and disease associations. Matching does not replace attention to the study question, but it improves the comparability of the groups for selected characteristics. When outcomes differ after matching, researchers have a stronger basis for considering the intervention or condition as a possible explanation for that difference.