These data were used in Horton and Ross (2003); Updated data can be obtained from the WHO Vitamin and Mineral Nutrition Information System http://www.who.int/vmnis/en/

Why do you think women and children have higher levels of anemia than adult men?  (Factors: for women menstrual losses, iron requirements for pregnancy; for children – lower intake of foods bioavailable in iron; higher iron requirements during fast growth periods; low iron stores at birth from anemic mothers, low iron intake during first two years of life).