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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.

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


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