TABLE 3.

Analysis of expected compared with observed changes in log-transformed sTfR values with each year of increasing age¹

		Change in log sTfR values
Age group	n	Observed2	Expected3	Difference between observed and expected
<12 mo	22	−0.01	0.07	−0.09
12 to <24 mo	37	−0.18	−0.14	−0.03
24 to <36 mo	42	−0.13	0.07	−0.20
36 to <48 mo	37	−0.10	−0.08	−0.02
48 to <60 mo	50	−0.25

¹sTfR, soluble transferrin receptor.

²Mean of (log sTfR from 2008 − log sTfR from 2007) categorized by age in 2007.

³Mean of log sTfR in 2007 of each indicated age group subtracted from the mean log sTfR from the group that was 1 y older in 2007.