metadat (version 1.4-0)

dat.curtin2002: Studies on Potassium Supplementation to Reduce Diastolic Blood Pressure

Description

Results from 21 cross-over studies evaluating the effect of potassium supplementation to reduce diastolic blood pressure.

Usage

dat.curtin2002

Format

The data frame contains the following columns:

author	character	first author
year	character	year of publication
N	integer	total sample size
mean	numeric	mean difference in diastolic blood pressure
SE	numeric	standard error
corr	numeric	within-patient correlation

Author

Guido Schwarzer, , https://github.com/guido-s/

Concepts

raw mean differences

Details

Results from 21 cross-over studies evaluating the effect of potassium supplementation to reduce diastolic blood pressure (Curtin et al., 2002, Table II).

This data set is used as an example in Schwarzer et al. (2015), Chapter 2.

References

Schwarzer, G., Carpenter, J. R., & Rücker, G. (2015). Meta-analysis with R. Cham, Switzerland: Springer.

Examples

### Show first five studies
head(dat.curtin2002, 5)

if (FALSE) {
### Load meta package
suppressPackageStartupMessages(library("meta"))

### Use DerSimonian-Laird estimator (which was the default in meta in the year 2015).
### Furthermore, print meta-analysis results with two digits.
oldset <- settings.meta(method.tau = "DL", digits = 2)

### Conduct meta-analysis
mg2 <- metagen(mean, SE, studlab = paste(author, year),
               data = dat.curtin2002, sm = "MD")
mg2

### Use previous settings
settings.meta(oldset)
}