sex of subject
0 = female
1 = male

level of education
1 = <high school
2 = high school
3 = college
4 = post college

race/ethnicity
1 = White
2 = Black
3 = Hispanic
4 = Asian/Pacific Islancer

subject on htn meds
0 = no
1 = yes

1 = highschool or less
2 = college or more