Observational studies allow to generalize results to a given geographical and demographical population, besides helping answer more specific questions, since the patients included in the study usually go through rigorous screening; on the other hand, they also have some disadvantages, such as the fact that results are very hard to reproduce by another investigator, because each observational study is usually unique.
- Descriptive Study: The objective is to describe and record a disease or attribute in a specific time frame.
- Analytical Study: It is a comparative analysis of groups of patients in which the investigator merely observes and describes what is happening, deducing possible interventions from routine clinical practice.
Observational Studies and Clinical Trials
- To study rare phenomena of a disease
- To describe little known diseases
- To know the clinical course of a clinical entity
- To obtain frequencies of several variables during the process
- To show potential risk factors
- To specify modifications and technological innovations