belcap: BELCAP Dental Data

In VGAMdata: Data Supporting the 'VGAM' Package

BELCAP Dental Data

Description

A prospective data set containing the DMFT index of children in Belo Horizonte at the beginning and end of the BELCAP study.

Usage

data(belcap)

Format

A data frame with 797 observations on the following 5 variables.

dmftb

a numeric vector, DMFT-Index at the beginning of the study.

dmfte

a numeric vector, DMFT-Index at the end of the study.

gender

a factor with levels 0 = female, 1 = male.

ethnic

a factor with levels 1 = dark, 2 = white, 3 = black.

school

the kind of prevention measure. A factor with levels 1 = oral health education, 2 = all four methods, 3 = control group, 4 = enrichment of the school diet with ricebran, 5 = mouthrinse with 0.2% NaF-solution, 6 = oral hygiene.

Details

This data set is from the Belo Horizonte Caries Prevention (BELCAP) study. The data is collected from children in Belo Horizonte (Brazil) aged seven years at the start of the study. In in order to determine which method(s) were best for preventing tooth decay, six treatments were randomized to six separate schools. The measure used is the decayed, missing and filled teeth (DMFT) index - a well known and important measure of a persons dental health. Only the eight deciduous molars are considered, so the lowest value is 0, and the highest is 8.

Source

https://onlinelibrary.wiley.com/ contains the data file (a supplement of the JRSSA article). Downloaded in January 2014 and formatted into R by J. T. Gray, [e-mail].

References

Bohning, D., D. Ekkehart, P. Schlattmann, L. Mendonca, and U. Kircher (1999). The Zero-Inflated Poisson Model and the Decayed, Missing and Filled Teeth Index in Dental Epidemiology, Journal of the Royal Statistical Society, A 162(2), 195–209.

Examples

data(belcap)
## maybe str(belcap) ; plot(belcap) ...

VGAMdata documentation built on Sept. 17, 2024, 9:09 a.m.