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Confidence Intervals for Percentage Reduction in Caries Increments

Division of Biostatistics, Columbia University School of Public Health, 600 West 168 Street, New York, New York 10032

J.L. Fleiss

Division of Biostatistics, Columbia University School of Public Health, 600 West 168 Street, New York, New York 10032

N.W. Chilton

Division of Biostatistics, Columbia University School of Public Health, 600 West 168 Street, New York, New York 10032

Confidence intervals are presented for the percentage reduction in mean caries increments associated with a test treatment relative to the mean increment associated with control. Approaches based on both the analysis of variance and the analysis of covariance are compared with respect to ease of computation and to the length of the confidence interval.

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• Snedecor, G.W. and Cochran, W.G.: Statistical Methods, 7th ed., Ames, Iowa: Iowa State University Press, 1980.
• Dubey, S.D.: On the Determination of Confidence Limits of an Index, Biometrics 22:603-609, 1966.[CrossRef][Medline] [Order article via Infotrieve]
• Dubey, S.D.; Lehnhoff, R.W.; and Radike, A.W.: A Statistical Confidence Interval for the True Percent Reduction in Caries Incidence Studies, J Dent Res 44:921-923, 1965.[Free Full Text]
• Finney, D.J.: Probit Analysis, 3rd ed., London: Cambridge University Press, 1971.
• Kingman, A.: A Method of Utilizing the Subjects' Initial Caries Experience to Increase Efficiency in Caries Clinical Trials, Community Dent Oral Epidemiol 7:87-90, 1979.[CrossRef][Medline] [Order article via Infotrieve]

Journal of Dental Research, Vol. 61, No. 6, 828-830 (1982)
DOI: 10.1177/00220345820610063801


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Wallenstein, S. Articles by Chilton, N.W. Search for Related Content PubMed PubMed Citation Articles by Wallenstein, S. Articles by Chilton, N.W. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Medline Plus Health Information Health Statistics Hazardous Substances DB SODIUM FLUORIDE Social Bookmarking                         What's this?