birthwt-grpreg: Risk Factors Associated with Low Infant Birth Weight
In grpreg: Regularization Paths for Regression Models with Grouped Covariates

This version of the data set has been deprecated and will not be supported in future versions. Please use Birthwt instead.

1	data(birthwt.grpreg)

This data frame contains the following columns:

low Indicator of birth weight less than 2.5kg
bwt Birth weight in kilograms
age1,age2,age3 Orthogonal polynomials of first, second, and third degree representing mother's age in years
lwt1,lwt2,lwt3 Orthogonal polynomials of first, second, and third degree representing mother's weight in pounds at last menstrual period
white,black Indicator functions for mother's race; "other" is reference group
smoke smoking status during pregnancy
ptl1,ptl2m Indicator functions for one or for two or more previous premature labors, respectively. No previous premature labors is the reference category.
ht History of hypertension
ui Presence of uterine irritability
ftv1,ftv2,ftv3m Indicator functions for one, for two, or for three or more physician visits during the first trimester, respectively. No visits is the reference category.