TABLE 6.
Longitudinal logistic regression* results: ORs (change after enrollment) for measures of iron status and venous Hb
| Group assignment | Ferritin (<26 ng/mL)
|
Ferritin (<12 ng/mL)
|
log (sTfR/ferritin) (≥2.07)
|
Venous Hb (<12.5 g/dL)
|
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OR | 95%CI | p value | OR | 95%CI | p value | OR | 95%CI | p value | OR | 95%CI | p value | |
| Iron status letter | 0.50 | (0.34–0.73) | 0.0004 | 0.43 | (0.33–0.73) | 0.0004 | 0.62 | (0.43–0.89) | 0.01 | 0.74 | (0.42–1.30) | 0.30 |
| No information letter | 1.20 | (0.90–1.59) | 0.22 | 1.76 | (1.19–2.66) | 0.004 | 1.49 | (1.12–1.98) | 0.006 | 1.69 | (0.99–2.88) | 0.05 |
| 38 mg of iron | 0.18 | (0.12–0.27) | <0.0001 | 0.17 | (0.08–0.34) | <0.0001 | 0.27 | (0.18–0.41) | <0.0001 | 0.49 | (0.21–1.12) | 0.09 |
| 19 mg of iron | 0.18 | (0.12–0.29) | <0.0001 | 0.15 | (0.07–0.33) | <0.0001 | 0.22 | (0.15–0.35) | <0.0001 | 0.51 | (0.26–0.97) | 0.04 |
| Placebo | 1.32 | (0.96–1.82) | 0.09 | 1.48 | (1.01–2.16) | 0.04 | 1.39 | (0.98–1.98) | 0.07 | 2.32 | (1.30–4.20) | 0.005 |
*
Longitudinal logistic 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.