| Value |
Category |
| 11 |
Basic (1 to 5 years); old system, year 1-3 |
| 14 |
Basic (1 to 5 years); old system, year 4 |
| 15 |
Basic (1 to 5 years); old system, year 5 |
| 21 |
Intermediate (1 to 3 years); old system, year 1 |
| 22 |
Intermediate (1 to 3 years); old system, year 2 |
| 23 |
Intermediate (1 to 3 years); old system, year 3 |
| 31 |
Middle (1 to 4 years); old system, year 1 |
| 32 |
Middle (1 to 4 years); old system, year 2 |
| 33 |
Middle (1 to 4 years); old system, year 3 |
| 34 |
Middle (1 to 4 years); old system, year 4 |
| 41 |
Primary (1 to 8 years); previous system, year 4-6 |
| 44 |
Primary (1 to 8 years); previous system, year 7-10 |
| 48 |
Primary (1 to 8 years); previous system, year 11 |
| 51 |
Secondary (1 to 4 years); previous system, year 1 |
| 52 |
Secondary (1 to 4 years); previous system, year 2 |
| 53 |
Secondary (1 to 4 years); previous system, year 3 |
| 54 |
Secondary (1 to 4 years); previous system, year 4 |
| 61 |
Primary (1 to 6 years); current system, year 1 |
| 62 |
Primary (1 to 6 years); current system, year 2 |
| 63 |
Primary (1 to 6 years); current system, year 3 |
| 64 |
Primary (1 to 6 years); current system, year 4 |
| 65 |
Primary (1 to 6 years); current system, year 5 |
| 66 |
Primary (1 to 6 years); current system, year 6 |
| 71 |
Secondary (1 to 6 years); current system, year 1 |
| 72 |
Secondary (1 to 6 years); current system, year 2 |
| 73 |
Secondary (1 to 6 years); current system, year 3 |
| 74 |
Secondary (1 to 6 years); current system, year 4 |
| 75 |
Secondary (1 to 6 years); current system, year 5 |
| 76 |
Secondary (1 to 6 years); current system, year 6 |
| 98 |
Unknown |
| 99 |
NIU (not in universe) |
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.