TABLE 4.

Change in the mean (Δ) from enrollment to final visit for measures of iron status and venous Hb

Group assignment†	Ferritin (ng/mL)		sTfR (mg/L)		log (sTfR/ferritin)		Venous Hb (g/dL)
	Δ	p value*	Δ	p value*	Δ	p value	Δ	p value
Iron status letter	10.3	<0.0001	0.13	0.10	−0.15	<0.0001	0.08	0.38
No information letter	0.3	0.69	0.57	<0.0001	0.04	0.29	−0.13	0.23
38 mg of iron	16.7	<0.0001	−0.08	0.99	−0.25	<0.0001	0.28	0.04
19 mg of iron	18.3	<0.0001	−0.21	0.18	−0.32	<0.0001	0.39	0.01
Placebo	0.8	0.77	0.60	0.01	0.04	0.52	−0.07	0.59

^*As ferritin and sTfR are log-normally distributed, the p values were calculated using SAS procedure t test on the log-transformed values.

^†Sample sizes differ due to missing data. The numbers for each group, in table order, are 89, 98, 73, 59, and 50.