| Value | Category | 
|---|---|
| 1 | illiteratell | 
| 2 | literate without diploma | 
| 3 | primary school (5 years) | 
| 4 | primary education(8 years) | 
| 5 | junior high school (8=5+3) | 
| 6 | vocational school at jr. high (8-9 = 5+ 3-4) | 
| 7 | high school 11-12 = 8-9 + 3-4 | 
| 8 | vocational school at high | 
| 9 | 2 year higher education (univ.) | 
| 10 | 4 year higher educationv (univ.) | 
| 11 | master and doctorate |