| Signs of intolerance | Workforce | Proportion in % of total |
| Asthenia | 20 | 76 |
| Vertigo | 20 | 76 |
| Dyspnea of effort | 18 | 72 |
| Headache | 18 | 72 |
| Tachycardia | 10 | 40 |
| Chest pain | 3 | 12 |
| Orthopnea | 2 | 8 |