cotinine {tlm} | R Documentation |
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
andyes
, 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))
[Package tlm version 0.2.0 Index]