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Table 4 Known groups analysis: comparison of hemoglobin level groups and treatment arms at Week 3

From: Qualitative and quantitative validation of the FACIT-fatigue scale in iron deficiency anemia

FACIT-fatigue WK 3 Hemoglobin (Hgb) Severity Treatment Arm
High Hgb (>12 g/dL) Low Hgb (< = 9 g/dL) Ferumoxytol Placebo
N 102 106 555 183
Mean 35.96 30.45 35.78 32.22
SD 10.82 11.64 11.31 10.92
Mean Difference (95 % CI) -5.51 (-8.59, -2.44) - 3.56 (-1.68, -5.43)
P value <0.001 <0.001