On this Picostat.com statistics page, you will find information about the intersalt data set which pertains to Blood pressure versus Salt; inter-population data. The intersalt data set is found in the DAAG R package. You can load the intersalt data set in R by issuing the following command at the console data("intersalt"). This will load the data into a variable called intersalt. If R says the intersalt data set is not found, you can try installing the package by issuing this command install.packages("DAAG") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the intersalt R data set. The size of this file is about 1,342 bytes.

Blood pressure versus Salt; inter-population data

Description

Median blood pressure, as a fuction of salt intake, for each of 52 human populations.

Usage

intersalt

Format

A data frame with 52 observations on the following 4 variables.

b

a numeric vector

bp

mean diastolic blood pressure (mm Hg)

na

mean sodium excretion (mmol/24h)

country

a character vector

Details

For each population took a sample of 25 males and 25 females from each decade in the age range 20 - 50, i.e. 200 individuals in all.

Source

Intersalt Cooperative Research Group. 1988. Intersalt: an international study of electrolyte excretion and blood pressure: results for 24 hour urinary sodium and potassium excretion. British Medical Journal 297: 319-328.

References

Maindonald, J.H. The Design of Research Studies ? A Statistical Perspective, viii + 109pp. Graduate School Occasional Paper 00/2, Australian National University 2000.

Examples

data(intersalt)
plot(bp ~ na, data=intersalt, xlab="Median sodium excretion (mmol/24h)",
     ylab="Median diatoluc blood pressure (mm Hg)")

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Dataset imported from https://www.r-project.org.