A clinical trial in which a test agent is compared to a standard treatment with known effects. The control group may receive no treatment, active treatment, placebo or dose comparison concurrent control.ontrolled study. An experiment or clinical trial in which two groups are used for comparison purpose.
Case-Control Study vs. Cohort on a Timeline. A case-control study is a type of study design used widely, originally developed in epidemiology, although its use has also been advocated for the social sciences. The case-control study design is often used in the study of rare diseases or as a preliminary study where little is known about the association between the risk factor and disease of interest. Compared to prospective cohort studies they tend to be less costly and shorter in duration. Randomized controlled trial: (RCT) A study in which people are allocated at random (by chance alone) to receive one of several clinical interventions. One of these interventions is the standard of comparison or control. The control may be a standard practice, a placebo (sugar pill), or no intervention at all. Someone who takes part in a randomized controlled trial (RCT) is called a participant or subject. RCTs seek to measure and compare the outcomes after the participants receive the interventions. Because the outcomes are measured, RCTs are quantitative studies. Case-control studies are often used to identify factors that may contribute to a medical condition by comparing subjects who have that condition/disease (the cases) with patients who do not have the condition/disease but are otherwise similar (the controls). The case-control study design is often used in the study of rare diseases or as a preliminary study where little is known about the association between the risk factor and disease of interest. Compared to prospective cohort studies they tend to be less costly and shorter in duration. Non-randomised controlled study (NRS) designs. Below are some types of Non-randomized controlled study (NRS) design used for evaluating the effects of interventions. Non-randomized controlled trial. An experimental study in which people are allocated to different interventions using methods that are not random.  controlled study. A clinical trial in which a test agent is compared to a standard treatment with known effects. The control group may receive no treatment, active treatment, placebo or dose comparison concurrent control.  Definition of CONTROLLED EXPERIMENT. : a complex experiment including one or more control experiments or blank determinations along with the actual experimental tests. ADVERTISEMENT. This word doesn't usually appear in our free dictionary, but the definition from our premium Unabridged Dictionary is offered here on a limited basis. Definition of Research, controlled. Research, controlled: A study that compared results from a treated group and a control group. The control group may receive no treatment, a placebo, or a different treatment. See also blinded study, control group, double-blinded study.  Definition: An experiment or clinical trial in which two groups are used for comparison purpose. More: In a controlled exposure study, one group of participants is exposed to a substance (e.g. a pollutant) while those in the  control  group are not. The results are then compared to determine the health effects of the substance being studied. In a placebo controlled study (often called simply controlled study), people in the treatment group are given the drug or treatment being tested while the control group receives a placebo or a different treatment. Source: GreenFacts. The term randomized trials omits mention of controls and can describe studies that compare multiple treatment groups with each other (in the absence of a control group). 1 This type of randomization can be combined with stratified randomization, for example by center in a multicenter trial, to ensure good balance of participant characteristics in each group.. 2  A special case of permuted-block randomization is random allocation, in which the entire sample is treated as one block. A randomized controlled trial (or randomized control trial; RCT) is a type of scientific (often medical) experiment, where the people being studied are randomly allocated one or other of the different treatments under study. 1 This type of randomization can be combined with stratified randomization, for example by center in a multicenter trial, to ensure good balance of participant characteristics in each group.. 2  A special case of permuted-block randomization is random allocation, in which the entire sample is treated as one block.
https://en.wikipedia.org/wiki/Case-control_study http://www.medicinenet.com/script/main/art.asp?articlekey=39532 https://en.wikipedia.org/wiki/Case-control_study http://childhoodcancer.cochrane.org/non-randomised-controlled-study-nrs-designs http://medical-dictionary.thefreedictionary.com/controlled+study http://www.merriam-webster.com/dictionary/controlled%20experiment http://www.medicinenet.com/script/main/art.asp?articlekey=5318 http://www.greenfacts.org/glossary/abc/controlled-study.htm https://en.wikipedia.org/wiki/Randomized_controlled_trial https://en.wikipedia.org/wiki/Randomized_controlled_trial
controlled study definition