Risk Factors for Low Birth Weight

SUMMARY:
       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.

DATA DESCRIPTION:
       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 mothers race. Levels are 1 (white),  2
       (black) and 3 (other).
smoke:    Indicator of mothers 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.

OTHER 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.