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Adequte cohort sizes for caries clinical trials
Community Dentistry and Oral Epidemiology
|January 1, 1978
Summary
Determining appropriate cohort sizes for caries clinical trials is crucial. This study recommends specific statistical methods, like Bonferroni t-statistics, for multi-group trials to ensure accurate results and adequate sensitivity.
Area of Science:
- Dental Research
- Biostatistics
- Clinical Trials
Background:
- Accurate cohort size determination is essential for the statistical power and validity of clinical trials.
- Previous methods for calculating sample sizes in multi-group caries trials may not be optimal for all study designs.
Purpose of the Study:
- To evaluate methods for determining cohort sizes in multi-group caries clinical trials.
- To provide guidance on selecting appropriate statistical approaches based on trial objectives.
Main Methods:
- Examination of statistical methods for cohort size determination.
- Comparison of multiple comparison methods (e.g., Bonferroni t-statistics) versus the F-test procedure.
- Development of tables for calculating group sizes for two-group and multi-group trials.
Main Results:
- The choice of cohort size determination method depends on the specific clinical trial design.
- Multiple comparison methods using Bonferroni type t-statistics are recommended for trials testing varying frequencies of caries inhibitor application.
- The F-test procedure may lead to unacceptably low sensitivity for primary comparisons.
Conclusions:
- Selecting the correct statistical method for cohort size calculation is critical for the success of multi-group caries clinical trials.
- The study provides practical tools (tables) to aid researchers in determining adequate group sizes for specified sensitivity levels.