| Hb levels (g/dl) | N | Mean | Min | Max |
| 7.0 - 9.9 | 29 | 0:53.46 | 0:19.09 | 4:49.06 |
| 10.0 - 12.9 | 33 | 1:18.01 | 0:24.04 | 3:00.00 |
| 13.0 - 16.0 | 32 | 2:11.32 | 0:00.00 | 3:34.05 |
| Total | 94 | 1:28.45 | 0:00.00 | 4:49.06 |