| Variable | Ferrous sulfate (n = 145) | Iron polymaltose complex (n = 145) | T | Df | p-value |
| Baseline hemoglobin (g/dl) | 9.3 ± 0.9 | 9.4 ± 0.9 | 0.013 | 288 | 0.990 |
| Hemoglobin at 4 weeks (g/dl) | 10.4 ± 0.9 | 10.5 ± 0.8 | −1.595 | 288 | 0.112 |
| Hemoglobin at 8 weeks (g/dl) | 11.3 ± 0.8 | 11.5 ± 0.7 | −2.786 | 288 | 0.006 |