| LELM: Lowest education level of mother |
| HELM: Highest education level of mother |
| HLELM: Highest-lowest education level of mother |
| DELM: Difference highest-lowest |
| RELM: Ratio highest-lowest |
| DLHEM: Difference lowest-highest |
| RLHEM: Ratio lowest-highest |
| SHLM: Secondary or higher |
| NHLM: None |
| PRLM: Primary |
| NOA: Not Applicable |
| EDLVL00TO05YR: 0-5 years |
| EDLVL06TO11YR: 6-11 years |
| EDLVL12PLUSYR: 12+ years |
| BACHELOR: Bachelor's or equivalent level |
| MASTER: Master's or equivalent level |
| DOCTORAL: Doctoral or equivalent level |
| TERTIARY: Short-cycle tertiary education |
| TOTL: Total |
| EDUC_HIGHER: Higher education |
| EDUC_NONE_PRIMARY: None and primary education |
| EDUC_SECONDARY: Secondary education |