observational_study

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observational_study [2022/02/15 09:27] – [Observational study] administradorobservational_study [2022/08/16 11:29] (current) administrador
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 ====== Observational study ====== ====== Observational study ======
  
-[[Observational]] [[study]] are one where [[researcher]]s observe the effect of a [[risk factor]], [[diagnostic test]], [[treatment]] or other [[intervention]] without trying to change who is or isn't exposed to it. +[[Analytical observational study]]
  
-An observational [[study]] draws inferences about the possible effect of a [[treatment]] on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator. 
  
-This is in contrast with experiments, such as [[randomized controlled trial]]s, where each subject is randomly assigned to a treated group or a control group. 
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-===== Types ===== 
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-[[Cohort study]]. 
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-[[Case control study]]. 
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-[[Cross-sectional study]]. 
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-[[Longitudinal cohort study]]. 
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-A Cross-sectional study evaluates the risk factors and effect at a single point in time without any follow-up. It provides more evidence than case series and is located on the level of evidence (LOE) between the case series study and the longitudinal retrospective cohort study. A longitudinal study evaluates the patient at different times. The classification can be retrospective ([[case control study]]) and prospective ([[cohort study]]).  
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-They are located on the level or quality of evidence between the cross-sectional studies and randomized clinical trial. In a retrospective cohort study, the outcome is measured at the end of the work, and the variables are verified in the database or patient records.  
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-In a prospective cohort study, the outcome and the measures are defined at the beginning of treatment and the patients are followed to verify if the disease is positive or not. 
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-see [[Prospective observational study]]. 
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-see [[Retrospective observational study]]. 
  • observational_study.txt
  • Last modified: 2022/08/16 11:29
  • by administrador