cotinine: Birth Weight and Cord Serum Cotinine

In tlm: Effects under Linear, Logistic and Poisson Regression Models with Transformed Variables

Birth Weight and Cord Serum Cotinine

Description

Simulated data for birth weight and cord serum cotinine levels in 351 newborns.

Usage

cotinine

Format

A data.frame with 351 observations on the following 4 variables:

cotinine

cord serum cotinine level in the mother (ng/ml).

logcotinine

logarithm of cotinine.

weight

birth weight (g).

underweight

a factor with levels no and yes, indicating underweight (weight < 2500 g).

Details

Data were simulated to emulate true data pattern observed in a real study (see References).

Source

See References.

References

Pichini S et al. Cord serum cotinine as a biomarker of fetal exposure to cigarette smoke at the end of pregnancy. Environmental Health Perspectives. 2000;108(11):1079-1083.

Examples

data(cotinine)
par(las = 1, mfrow = c(2, 2))
with(cotinine, plot(cotinine, weight))
with(cotinine, plot(logcotinine, weight))
with(cotinine, boxplot(cotinine ~ underweight))
with(cotinine, boxplot(logcotinine ~ underweight))

tlm documentation built on April 4, 2025, 1:06 a.m.