Table 3:

Effects of iron supplementation at 12 weeks on biological markers, by initial concentration of hemoglobin

Variable	Treatment effect* 12 weeks – baseline (95%CI)		p value, interaction term
	Initial hemoglobin level < 13.0 g/dL n = 49	Initial hemoglobin level ≥ 13.0 g/dL n = 149
Hemoglobin, g/dL	0.97 (0.54 to 1.40)	0.09 (−0.22 to 0.41)	< 0.001
Ferritin, μg/L	8.4 (2.0 to 14.8)	12.7 (7.5 to 17.9)	0.4
Mean corpuscular volume, fL	1.0 (−1.8 to 3.9)	2.2 (0.9 to 3.5)	0.4
Hematocrit, %	2.3 (0.2 to 4.4)	0.5 (−0.7 to 1.7)	0.1
Transferrin, g/L	−0.1 (−0.4 to 0.2)	−0.2 (−0.4 to 0.03)	0.5
Soluble transferrin receptor, mg/L	−0.89 (−1.6 to −0.2)	−0.4 (−0.6 to −0.1)	0.05
Transferrin saturation, %	2.5 (−5.7 to 10.7)	3.8 (−1.7 to 9.2)	0.8

Note: CI = confidence interval.

^*A hot-deck method with 10 imputations was used to account for data that were missing and lost to follow-up.