Table 3 ‘4X4 SEP’ table, combining education and income levels
| Â | Income | |||
|---|---|---|---|---|
Low | Lower-middle | Upper-middle | High | |
Education | ||||
 Primary education < 10 yrs | 1 | 2 | 2 | 4 |
 Upper secondary/vocational | 2 | 2 | 3 | 5 |
 Undergraduate degree | 4 | 5 | 5 | 7 |
 Postgraduate degree | 7 | 7 | 8 | 10 |