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Ridit Analysis in Dental Clinical Studies

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

Neal W. Chilton

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

Sylvan Wallenstein

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

Ridit analysis is presented as an appropriate method of analyzing dental clinical data which fall somewhere between the purely categorical (e.g., improved vs. not improved) and the bona fide quantitative (e.g., mg % salivary calcium) scales of measurement. The key feature of the method is the estimation of the probability that a randomly-selected patient from one treatment group is "better-off" than a randomly-selected patient from another. Methods are presented for testing statistical significance and constructing confidence intervals. The method is illustrated on data from a comparative clinical trial of ibuprofen, aspirin and placebo in the relief of post-extraction pain. There were no significant differences in efficacy among the active treatments, but each was significantly superior to placebo.

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Journal of Dental Research, Vol. 58, No. 11, 2080-2084 (1979)
DOI: 10.1177/00220345790580110701


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map 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 Fleiss, J. L. Articles by Wallenstein, S. Search for Related Content PubMed PubMed Citation Articles by Fleiss, J. L. Articles by Wallenstein, S. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB ACETYLSALICYLIC ACID IBUPROFEN Medline Plus Health Information Health Statistics Social Bookmarking                         What's this?