|
| Primary level | Secondary level | University level | Total | |
| 18 - 29 years | Experimental sample | 4 | 6 | 5 | 15 |
| Control sample | 4 | 7 | 6 | 17 | |
| 30 - 39 years | Experimental sample | 5 | 3 | 2 | 10 |
| Control sample | 1 | 3 | 7 | 11 | |
| 40 - 49 years | Experimental sample | 3 | 7 | 2 | 12 |
| Control sample | 4 | 4 | 2 | 10 | |
| 50 years and over | Experimental sample | 7 | 3 | 3 | 13 |
| Control sample | 4 | 4 | 4 | 12 | |
| Total | 32 | 31 | 37 | 100 | |