Trends in iron deficiency anemia research 2001-2020: A bibliometric analysis

Table 2 Top 25 keywords of each 5-year interval between 2001-2020 color coded to the clusters identified in Figure 4

2001	2006		2011	2016
Iron-deficiency anemia3	Iron-deficiency anemia3		Iron-deficiency anemia3	Iron-deficiency anemia3
Anemia1	Anemia1		Anemia1	Anemia1
Children1	Iron deficiency anemia1		Iron deficiency anemia1	Iron deficiency anemia1
Iron deficiency anemia1	Children1		Children1	Prevalence1
Iron deficiency2	Iron deficiency2		Iron deficiency2	Children1
Iron5	Prevalence1		Prevalence1	Iron deficiency2
Prevalence1	Diagnosis3		Iron5	Diagnosis3
Serum ferritin5	Iron5		Diagnosis3	Management3
Ferritin5	Supplementation1		Supplementation1	Iron5
Supplementation1	Infants1		Hepcidin5	Supplementation1
Diagnosis3	Serum ferritin5		Management3	Pregnancy1
Absorption2	Women1		Hemoglobin1	Hepcidin5
Deficiency5	Hemoglobin1		Pregnancy1	Hemoglobin1
Infants1	Absorption2		Ferritin5	Risk3
Erythropoietin4	Deficiency5		Intravenous iron4	Intravenous iron4
Pregnancy1	Hepcidin5		Women1	Women1
Women1	Therapy4		Deficiency anemia1	Ferritin5
Therapy4	Iron-deficiency1		Disease3	Oral iron4
Hemoglobin1	Growth1		Inflammation5	Health1
Eradication3	Helicobacter pylori3		Risk3	Disease3
Serum transferrin receptor5	Pregnancy1		Association3	Infants1
Helicobacter pylori3	Disease3		Metabolism1	Deficiency5
Iron-deficiency1	Risk3		Infants1	Iron-deficiency1
Deficiency anemia1	Celiac disease3		Serum ferritin5	Deficiency anemia1
Disease3	Expression5		Deficiency5	Ferric carboxymaltose4
Number of keywords
Red
11	12		11	12
Purple
2	2		1	1
Blue
5	5		6	5
Yellow
2	1		1	3
Green
5	5		6	4
New items in each quartile
(None)		Serum ferritin5	Management3	Oral iron4
		Hepcidin5	Intravenous iron4	Health1
		Growth1	Inflammation5	Ferric carboxymaltose4
		Risk3	Association3
		Celiac disease3	Metabolism1
		Expression5	Infants1

¹Red.

²Purple.

³Blue.

⁴Yellow.

⁵Green.

Summary shows the number of keywords in each 5-year quartile by cluster and a list of the keywords appearing for the first time in the top-25 list for each quartile.