Description

Meta-analysis of studies comparing two different toothpastes.

Usage

Format

A data frame with 9 observations on the following 7 variables.

Study

the identifier of the study.

nA

number of subjects using toothpaste A.

meanA

mean DMFS index of subjects using toothpaste A.

sdA

standard deviation of DMFS index of subjects using toothpaste A.

nB

number of subjects using toothpaste B.

meanB

mean DMFS index of subjects using toothpaste B.

sdB

standard deviation of DMFS index of subjects using toothpaste B.

Details

The data are the results of nine randomised trials comparing two different toothpastes for the prevention of caries development. The outcomes in each trial was the change, from baseline, in the decayed, missing (due to caries) and filled surface dental index (DMFS).

Source

B. S. Everitt and A. Pickles (2000), Statistical Aspects of the Design and Analysis of Clinical Trials, Imperial College Press, London.

Examples