Stacy, Perriman, and Whitney (1985) studied pesticide residues in human
milk in Western Australia in 1979-80.  Earlier research had discovered
high pesticide levels.  Stacey et al. hoped to show that levels had decreased
due to stronger government controls over the use of pesticides on food crops.
They did find decreases for several types of pesticides, but levels of
dieldrin had increased substantially.

This datasets has information from 45 donors.  The variables are:
   age in years
   whether they lived in a new suburb (0 = old, 1 = new)
   whether their house was treated for termites within the past 3 years
               (0 = no, 1 = yes, two missing values)
   whether their milk contained above-average levels of dieldrin
       (0 = no, 1 = yes; above average defined as > .009 parts per million)

Termites are a common problem in Western Australia, and dieldrin is often
used to control them.  By law, new houses must be pretreated for termites.