=1 if employer offers insurance
ratio of SSI income to toatl income
Age
Years of education
#Visits to doctor
#Visits to health professional, but not doctor
# Emergency Room Visits
# Hospital Admissions
=1 if has Medicaid public insurance
=1 if has private supplementary insurance
=1 if female
=1 if physical limitation
=1 if activity limitation
# chronic conditions
Age-squared