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Biomedical subjects

J C Cecil

Publications and source records attributed to J C Cecil.

12 recordsLinked to original sources
PubMed1984

Computerized method for the graphic representation of multivariate periodontal data.

Appreciation of the multivariate features of data from periodontal research studies is sometimes difficult. This appears to be due to the form of tables and graphs in which information is made available in published studies. A computerized graphical technique, which appears well suited to the multivariable situation, is described. It uses structural analogy between the measurement scales and the variables measured and provides what can be a compelling iconic description of multifaceted data.

Computers↗
PubMed1983

Applicability of multiple covariance analysis in caries studies.

The relationship between pre- and posttreatment DMFS measures in clinical trials of dentifrices may be quadratic rather than linear and, if linear, the slope may differ from one. Given either of these eventualities the traditional DMFS increment measurement does not utilize all the information available in the pre-DMFS baseline score. If nonlinearity is present, analysis of multiple covariance with parameters derived from a polynomial regression is indicated.

Analysis of Variance↗
PubMed1982

Method for automated entry of a dental chart schematic using a computer card reader.

A method was developed in which a dental chart schematic, printed on a standard 80-column computer card, could be used to record DMF data for analysis using mark sensing technology. The binary image of each column was read by a standard card reader and this information was used to create a detailed DMF analysis. This method uses readily available technology and could be modified for many research purposes.

Computers↗
PubMed1982

Empirical verification of confidence intervals computed from dental data.

Sampling experiments were conducted on five distributions of dental epidemiological data which varied in degree of positive skew. The tendency of nominal confidence intervals to be underestimated and asymmetric in the two tails increased with skew and decreased with increasing sample size. The findings conform to theoretical expectations and demonstrate the importance of the normality assumption regarding sampling distributions. A rule is presented which identifies a sample size so that the 95% confidence probability statement would be incorrect no more than 6% of the time.

DMF Index↗
PubMed1978

Saliva-based colorimetric test as an index of gingival inflammation in epidemiologic studies.

There is a pressing need for a reliable, low-cost method of assessing the gingival and periodontal status of large population groups. Existing indexes, despite their value in dental public health, are still too subject to examiner variability for use by uncalibrated examiners. This study describes an evaluation of a quick, inexpensive, extraoral colorimetric test for gingival inflammation, based on a reaction between saliva and the test material. It could probably be applied by non-professional personnel. In this study, the test was applied to a population of elementary schoolchildren, dental hygiene students and faculty, and adult inmates of two correctional institutions. These populations were chosen on the assumption that they would exhibit varying intensities of gingival inflammation. Values obtained from the colorimetric test carried out by one researcher were compared with Gingival Index (GI) scores observed by a different examiner. Results suggest that the colorimetric test may be a valid, reliable means of detecting major differences in the prevalence of gingival inflammation in most adult populations, although having little, if any, useful application among children at the mixed dentition stage.

Adolescent↗