Father's Education
2 = Less than highschool
3 = High school graduate
4 = Less than 2 years' vocational education
5 = More than 2 years' vocational education
6 = Less than 2 years' college/university education
7 = More than 2 years' college/university education
8 = College/University graduate
9 = Master's degree
10 = MD/PhD

Mother's Education
2 = Less than high school
3 = High school graduate
4 = Less than 2 years' vocational education
5 = More than 2 years' vocational education
6 = Less than 2 years' college/university education
7 = More than 2 years' college/university education
8 = College/University graduate
9 = Master's degree
10 = MD/PhD

Gender
0 = Male
1 = Female

Father's Education
1 = Less than high school
2 = High school graduate
3 = Some post-secondary education
4 = College/University graduate & beyond