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Design and Implementation of Observational Studies Emulating a Target Trial.
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Respiratory Care, 2023
Studies can be observational or experimental. With an observational study, the investigator does not determine the assignment of subjects, and there might not be a control group. If there is a control group, assignment of the independent variable (exposure or intervention) is not under the control of the investigator.
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Studies can be observational or experimental. With an observational study, the investigator does not determine the assignment of subjects, and there might not be a control group. If there is a control group, assignment of the independent variable (exposure or intervention) is not under the control of the investigator.
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Clinical Obstetrics and Gynecology, 1998
Observational studies are important methodologies to evaluate exposures and risk factors that are not amenable to experimental trials. They offer the advantage of being more generalizable to our patients, as these studies may have more liberal inclusion criteria than the typical randomized trial. Their disadvantage is their susceptibility to biases and
J F, Peipert, M G, Phipps
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Observational studies are important methodologies to evaluate exposures and risk factors that are not amenable to experimental trials. They offer the advantage of being more generalizable to our patients, as these studies may have more liberal inclusion criteria than the typical randomized trial. Their disadvantage is their susceptibility to biases and
J F, Peipert, M G, Phipps
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Registration of observational studies
BMJ, 2010The next step towards research transparency Observational studies, such as cohort and case-control studies, are an important form of medical research, but they are also vulnerable to bias and selective reporting.1 They often produce large datasets that can be subjected to multiple analyses.
Elizabeth, Loder +2 more
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The American Journal of Nursing, 1954
aides and attendants on our staff. All are between the ages of 17 and 45, the average being 18 years. They have been graduated from high school or have comparable education or experience. Many of our attendants are young men who are attending junior college and who work four to six hours daily during the school week and sometimes eight hours on ...
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aides and attendants on our staff. All are between the ages of 17 and 45, the average being 18 years. They have been graduated from high school or have comparable education or experience. Many of our attendants are young men who are attending junior college and who work four to six hours daily during the school week and sometimes eight hours on ...
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Coherence in Observational Studies
Biometrics, 1994It is often said that the coherence of an association between a treatment and outcomes is important in judging whether the association is causal. An attempt is made to quantify the evidence provided by a coherent association. This is done in two steps. First, a test is developed to detect a coherent association.
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2007
Much can be learned about a process by observing changes over time or by comparing two different processes under different conditions. This chapter introduces the major types of observational study designs: the longitudinal or cohort study, the comparative or case-control study, and some of their variants.
Raymond G, Hoffmann, Hyun Ja, Lim
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Much can be learned about a process by observing changes over time or by comparing two different processes under different conditions. This chapter introduces the major types of observational study designs: the longitudinal or cohort study, the comparative or case-control study, and some of their variants.
Raymond G, Hoffmann, Hyun Ja, Lim
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American Journal of Orthodontics and Dentofacial Orthopedics, 2014
Bias is an important issue in observational studies, and it should be carefully considered when interpreting the results of such studies. In this article, I will highlight the main types of bias encountered in observational studies. Bias is a systematic error in the design and methods of the study, leading to an incorrect interpretation.
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Bias is an important issue in observational studies, and it should be carefully considered when interpreting the results of such studies. In this article, I will highlight the main types of bias encountered in observational studies. Bias is a systematic error in the design and methods of the study, leading to an incorrect interpretation.
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An approach to observational studies
Forensic Science, Medicine, and Pathology, 2007Medical publishing is an interesting activity that involves careful study and analysis of data followed by writing and submission of reports to peer-reviewed journals for dissemination to the wider audience of colleagues. There is often great pressure on individuals in specialist fields to perform research and to achieve a respectable list of ...
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