| Category | Ranges of mean values of α | Percentage (%) |
| Very few knowledge | 0 - 0.33 | 19.0 |
| Medium knowledge | 0.34 - 0.66 | 45.0 |
| Enough knowledge | 0.67 - 1.00 | 36.0 |
| Total (mean level) | 0.55 | 100.0 |