Participants who were excluded because of missing sTfR, CRP, AGP, or malaria observations did not differ from those who were included with regard to sex or socioeconomic status (data not shown), although children were older (mean age in months ± SD) in the full data set (29.9 ± 15.7 compared with 24.8 ± 14.9 mo, respectively). The gene discussed is TFRC; the disease is malaria.