| Value |
Category |
| 1 |
one grade |
| 2 |
2 grades |
| 3 |
|
| 4 |
|
| 5 |
|
| 6 |
|
| 7 |
|
| 8 |
|
| 9 |
|
| 10 |
|
| 11 |
|
| 12 |
12/13 grades |
| 13 |
|
| 91 |
no education |
| 92 |
post high-school, university, master degree, Ph.D |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.