| Intensity | N | % |
| Serious, life-threatening or incapacitating | 3 | 1.0 |
| Death | 3 | 1.0 |
| Severe | 18 | 6.2 |
| Moderate | 74 | 25.5 |
| Mild | 192 | 66.3 |
| Total | 290 | 100.0 |