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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Transfusion. 2016 Jan 26;56(6 Pt 2):1588–1597. doi: 10.1111/trf.13469

TABLE 5.

Longitudinal regression* results: change after enrollment (Δ) for measures of iron status and venous Hb, by group assignment

Group assignment log Ferritin
log sTfR
log (sTfR/ferritin)
Venous Hb
Δ p value Δ p value* Δ p value Δ p value
Iron status letter 0.09 <0.0001 0.01 0.33 −0.08 0.005 −0.04 0.60
No information letter −0.05 0.007 0.04 <0.0001 0.09 <0.0001 −0.34 <0.0001
38 mg of iron 0.24 <0.0001 −0.04 0.0003 −0.28 <0.0001 0.31 0.0001
19 mg of iron 0.23 <0.0001 −0.03 0.0005 −0.26 <0.0001 0.32 0.0002
Placebo −0.04 0.01 0.04 <0.0001 0.09 <0.0001 −0.33 <0.0001
*

Longitudinal regression adjusting for race, sex, age, center, weight, smoking status, pregnancy history, menstrual status, number of donations in previous 2 years, and time since last donation.