| Value | Category |
|---|---|
| 000 | None |
| 100 | Preschool |
| 110 | Preschool, years unspecified |
| 120 | Preschool, 0 years |
| 130 | Preschool, 1 year |
| 140 | Preschool, 2 years |
| 200 | Primary |
| 210 | Primary, 0 years |
| 220 | Primary, 1 year |
| 230 | Primary, 2 years |
| 240 | Primary, 3 years |
| 250 | Primary, 4 years |
| 260 | Primary, 5 years |
| 270 | Primary, years unspecified |
| 300 | Secondary |
| 310 | Secondary, 0 years |
| 320 | Secondary, 1 year |
| 330 | Secondary, 2 years |
| 340 | Secondary, 3 years |
| 350 | Secondary, 4 years |
| 360 | Secondary, 5 years |
| 370 | Secondary, 6 years |
| 380 | Secondary, years unspecified |
| 390 | Teaching school (2005) |
| 391 | 3 years |
| 392 | 4 years |
| 399 | Years unspecified |
| 400 | Unspecified level |
| 401 | University, 0 years |
| 402 | University, 1 year |
| 403 | University, 2 years |
| 404 | University, 3 years |
| 405 | University, 4 years |
| 406 | University, 5 years |
| 407 | University, 6 years |
| 408 | University, 7 years |
| 409 | University, 8 years |
| 410 | University, 9 years |
| 419 | University, level unspecified |
| 420 | Professional technical (2005) |
| 421 | Professional technical, 1 year |
| 422 | Professional technical, 2 years |
| 429 | Professional technical, years unspecified |
| 430 | Technological (2005) |
| 431 | Technological, 1 year |
| 432 | Technological, 2 years |
| 433 | Technological, 3 years |
| 439 | Technological, years unspecified |
| 440 | Undergraduate college (2005) |
| 441 | Undergraduate college, 1 year |
| 442 | Undergraduate college, 2 years |
| 443 | Undergraduate college, 3 years |
| 444 | Undergraduate college, 4 years |
| 445 | Undergraduate college, 5 years |
| 446 | Undergraduate college, 6 years |
| 449 | Undergraduate college, years unspecified |
| 500 | Graduate education |
| 510 | Specialization (2005) |
| 511 | Graduate education, specialization, 1 year |
| 512 | Graduate education, specialization, 2 years |
| 519 | Graduate education, specialization, years unspecified |
| 520 | Masters program (2005) |
| 521 | Masters program, 1 year |
| 522 | Masters program, 2 years |
| 523 | Masters program, 3 years |
| 529 | Masters program, years unspecified |
| 530 | Doctoral program (2005) |
| 531 | Doctoral program, 1 year |
| 532 | Doctoral program, 2 years |
| 533 | Doctoral program, 3 years |
| 534 | Doctoral program, 4 years |
| 535 | Doctoral program, 5 years |
| 536 | Doctoral program, 6 years |
| 539 | Doctoral program, years unspecified |
| 590 | University graduate, years unspecified |
| 600 | Other |
| 601 | Other, 0 years |
| 602 | Other, 1 year |
| 603 | Other, 2 years |
| 604 | Other, 3 years |
| 605 | Other, 4 years |
| 606 | Other, 5 years |
| 607 | Other, 6 years |
| 610 | Special education, years unspecified |
| 620 | Fundamental education, years unspec |
| 998 | Unknown/missing |
| 999 | NIU (not in universe) |
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