lead: Subsample (N=50) of data on blood lead levels from the...

In ALA: Data sets and examples for the book "Applied Longitudinal Analysis"

Description

The Treatment of Lead-Exposed Children (TLC) trial was a placebo-controlled, randomized study of succimer (a chelating agent) in children with blood lead levels of 20-44 micrograms/dL.

Usage

data(lead)

Format

A data frame with 200 observations on the following 3 variables.

id

a factor with 50 levels

week

a numeric vector

lead

a numeric vector; lead level

Details

These data consist of four repeated measurements of blood lead levels obtained at baseline (or week 0), week 1, week 4, and week 6 on 50 children who were randomly assigned to chelation treatment with succimer.

Note

Original variable names have been adapted to R conventions. Data were reshaped from wide to long format and the response named lead.

Source

http://biosun1.harvard.edu/~fitzmaur/ala

References

Treatment of Lead-exposed Children (TLC) Trial Group (2000) Safety and Efficacy of Succimer in Toddlers with Blood Lead Levels of 20-44 micrograms/dL. Pediatric Research 48:593-599

Examples

str(lead)
summary(lead)

ALA documentation built on May 2, 2019, 5:39 p.m.