| Hemoglobin (g/dL) | Cold agglutinin test | Total n (%) | |
| Negative n (%) | Positive n (%) | ||
| Below normal (men & women) | 75 (41.9) | 9 (100.0) | 84 (44.7) |
| Normal (men & women) | 103 (57.8) | 0 (0.0) | 103 (54.8) |
| Above normal | 1 (0.6) | 0 (0.0) | 1 (0.5) |
| Total | 179 (100.0) | 9 (100.0) | 188 (100.0) |
| Mean Std dev | 12 ± 2.5 | 11.1 ± 2.9 | 11.8 ± 2.6 |