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Evaluating the evidence: statistical methods in randomized controlled trials in the urological literature
Charles D Scales1, Regina D Norris, Glenn M Preminger
1Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA.
The Journal of Urology
|August 20, 2008
Summary
Statistical reporting in urological randomized controlled trials has improved since 1996, with more studies justifying sample sizes. However, deficiencies in reporting primary outcomes and effect sizes persist, indicating a need for continued statistical education.
Area of Science:
- Urology
- Clinical Trials
- Biostatistics
Background:
- Randomized controlled trials (RCTs) are crucial for clinical decision-making.
- Statistical methodology is integral to the validity of RCTs.
- Previous evaluations of statistical methods in urological RCTs are limited.
Purpose of the Study:
- To formally evaluate statistical methods used in urological RCTs.
- To compare statistical reporting in 1996 versus 2004.
- To identify areas for improvement in urological research methodology.
Main Methods:
- Systematic review of human RCTs published in four leading urology journals in 1996 and 2004.
- Utilized a standardized evaluation form based on the Consolidated Standards of Reporting Trials (CONSORT) statement.
- Two independent reviewers, blinded to study details, assessed each article, with discrepancies resolved by consensus.
Main Results:
- 152 RCTs were reviewed (65 in 1996, 87 in 2004).
- Sample size justifications increased significantly from 19% in 1996 to 47% in 2004 (p=0.001).
- Reporting of primary outcomes, effect sizes, and precision showed non-significant trends toward improvement.
Conclusions:
- Statistical reporting in urological RCTs has shown improvement between 1996 and 2004.
- Significant deficiencies in statistical reporting, particularly regarding primary outcomes and effect sizes, remain.
- Continued education in applied statistics is recommended to enhance the quality of urological RCT reporting.
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