| ISCED 0 - Early childhood education |
| ISCED 1 - Primary education |
| ISCED 2 - Lower secondary education |
| ISCED 3 - Upper secondary education |
| ISCED 4 - Post-secondary non-tertiary education |
| ISCED 5 - Short-cycle tertiary education |
| ISCED 6 - Bachelor's or equivalent level |
| ISCED 7 - Master's or equivalent level |
| ISCED 8 - Doctoral or equivalent level |
| ISCED 9 - Not elsewhere classified |