Educational and occupational levels of both parents used in forming the Hollingshead index of socioeconomic class
| Education | Score | Occupation | Score |
| No education | 0 | No occupation | 0 |
| Elementary school | 1 | Workman | 1 |
| Junior school | 2 | Blue collar worker | 2 |
| High school | 3 | White collar worker | 3 |
| University | 4 | Professional | 4 |
Educational and occupational scores of parents:
0–4, I
5–8, II
9–12, III
13–16, IV