The valuable contribution of observational studies to nephrology

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Presentation transcript:

The valuable contribution of observational studies to nephrology K.J. Jager, V.S. Stel, C. Wanner, C. Zoccali, F.W. Dekker Kidney International Volume 72, Issue 6, Pages 671-675 (September 2007) DOI: 10.1038/sj.ki.5002397 Copyright © 2007 International Society of Nephrology Terms and Conditions

Figure 1 Contribution of different study designs to clinical research. The increase in evidence from the bottom to the top only applies to studies on the effect of therapy (or other interventions). Footnote: As cross-sectional studies play a very limited role in studies on effects of therapy, this study design was not included in the figure. Kidney International 2007 72, 671-675DOI: (10.1038/sj.ki.5002397) Copyright © 2007 International Society of Nephrology Terms and Conditions