| Countries | Test Elements | Values |
| Mozambique | Mean | 0.08 |
| Standard deviation | 0.08 | |
| N | 45 | |
| Portugal | Mean | 0.13 |
| Standard deviation | 0.13 | |
| N | 75 | |
| Levene test | F = 3.426 | P Value: 0.067 |
| Two-tailed t-test | t = (2.077) | P Value: 0.040 |
| Unilateral t-test, Left |
| P Value: 0.020 |