birthwt {boot}R Documentation

Risk Factors for Low Birth Weight

Description

The birthwt data frame has 189 rows and 10 columns.

Data was collected at the Baystate Medical Center, Springfield, Massachusetts during 1986 to attempt to identify which factors contributed to an increased risk of low birth weight infants. Information was recorded for 189 women of whom 59 had low birth weight infants.

Usage

data(birthwt)

Format

This data frame contains the following columns:

low
Indicator of low birth weight; 1 indicates low birth weight (< 2.5kg), 0 indicates normal birth weight.
age
Mother's age in years at the time of birth.
lwt
The mother's weight (in pounds) at the time of the last menstrual period.
race
A factor for the mother's race. Levels are 1 (white), 2 (black) and 3 (other).
smoke
Indicator of mother's smoking status; 1=smoker, 0=non-smoker.
ptl
Number of previous premature labours.
ht
Indicator of hypertension history; 1=yes, 0=no.
ui
Indicator of the presence of uterine irritability; 1=yes, 0=no.
ftv
Number of physician visits during the first trimester
bwt
Infant's birth weight in grams

Source

The data were obtained from

Hosmer, D.W. and Lemeshow, S. (1989) Applied Logistic Regression. John Wiley.

References

Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.

Venables, W.N. and Ripley, B.D. (1994) Modern Applied Statistics with S-Plus. Springer-Verlag.