1988 family income, $1000s
cig. tax in home state, 1988
cig. price in home state, 1988
birth weight, ounces
father's yrs of educ
mother's yrs of educ
birth order of child
=1 if male child
=1 if white
cigs smked per day while preg
birth weight, pounds
packs smked per day while preg