Twenty-five studies reported endline hemoglobin concentrations, 14 reported ferritin concentration, 15 reported urinary iodine concentration, 4 reported zinc protoporphyrin (ZnPP), 11 reported soluble transferrin receptor (sTfR), 5 reported serum folate, 9 reported body iron concentration, 4 reported serum retinol, 2 reported serum vitamin B12, 3 reported serum zinc, 16 reported anemia prevalence, 9 reported IDA prevalence, 5 reported ID, 2 reported various measures of cognition, and 2 reported work productivity using a variety of measures. The gene discussed is TFRC; the disease is anemia.