[Why do observational research if there is already a randomised controlled trial?]

Area of Science:

• Medical research methodology
• Comparative effectiveness research
• Pharmaceutical studies

Background:

• Observational comparative research is sometimes conducted after large randomized trials (RCTs) are published.
• The rationale for continuing observational studies post-RCT is often questioned.

Purpose of the Study:

• To explore the justifications for conducting observational research even when RCT results are available.
• To highlight the evolving methodologies in observational research for treatment effect evaluation.
• To address the inherent limitations and potential biases in observational studies.

Main Methods:

• Review of existing literature and methodologies in observational research.
• Discussion of the utility of observational data in complementing RCT findings.
• Analysis of statistical approaches and their susceptibility to researcher bias.

Main Results:

• Observational research offers unique insights into real-world treatment effects beyond RCTs.
• Methodological advancements enhance the capability to assess diverse treatment outcomes.
• Statistical analysis in observational studies can be influenced by non-predefined researcher decisions, introducing potential errors.

Conclusions:

• Observational research continues to hold relevance for evaluating medical interventions, even post-RCT.
• Continued development in methods strengthens the value of observational studies.
• Awareness and mitigation of statistical analysis biases are crucial for the integrity of observational research findings.