BWT	=	birth weight (in ounces);
Age	=	maternal age upon admission to hospital;
Male	=	dummy variable equal to 1, if child is male;
MB	=	dummy variable equal to 1, if multiple birth;
Married	=	dummy variable equal to 1, if mother is married;
Premat	=	dummy variable equal to 1, if labor is premature;
Non-White	=	dummy variable equal to 1, if mother is black or Hispanic; and
No-Care	=	dummy variable equal to 1, if mother did not receive prenatal care.