교육 수준의 경우 '고졸 미만', '고졸', '대재 및 대졸', 그리고 '대학원 이상'의 4점 척도를 사용하였다.
For the education level, a four-point scale of "less than a high school graduate," "high school graduate," "daejae and college graduate," and "above graduate school" was used.