The California Child Health and Development Study involved women on 
  the Kaiser Health plan who received prenatal care and later gave
  birth in the Kaiser clinics.  Approximately 19,000 live-born children 
  were delivered in the 20,500 pregnancies. We consider the 680 live-born
  white male infants in the study.  Data were collected on a variety of 
  features of the child, the mother, and the father. 

  The columns in the data set are, from left to right: 

  1) ID 
  2) child's head circumference (inches)
  3) child's length (inches)
  4) child's birth weight (pounds)
  5) gestation (weeks)
  6) maternal age (years)
  7) maternal smoking (cigarettes/day)
  8) maternal height (inches)
  9) maternal pre-pregnancy weight (pounds)
 10) paternal age (years)
 11) paternal years of education
 12) paternal smoking (cigarettes/day)
 13) paternal height (inches)