Table 3. Betweenness-Centrality Rankings on unmodified High and Low income population networks.

Rank	Low Income Population			High Income Population
	ICD Code	Betweenness Centrality	Diagnosis Name	ICD Code	Betweenness Centrality	Diagnosis Name
1	250	0.300	Diabetes mellitus	401	0.295	Essential hypertension
2	401	0.210	Essential hypertension	427	0.162	Cardiac dysrhythmias
3	305	0.102	Nondependent abuse of drugs	272	0.128	Disorders of lipoid metabolism
4	276	0.070	Disorders of fluid, electrolyte, and acid-base	285	0.121	Other and unspecified anemias
5	496	0.047	Chronic airway obstruction not elsewhere classified	244	0.094	Acquired hypothyroidism
6	285	0.041	Other and unspecified anemias	648	0.081	Other current conditions in the mother classifiable elsewhere but complicating pregnancy, childbirth, or the puerperium
7	428	0.038	Heart failure	276	0.080	Disorders of fluid electrolyte, and acid-base balance
8	278	0.028	Overweight, obesity and other hyperalimentatio	311	0.057	Depressive disorder not elsewhere classified
9	414	0.026	Other forms of chronic ischemic heart disease	424	0.028	Other diseases of endocardium
10	599	0.020	Other disorders of urethra and urinary tract	733	0.026	Other disorders of bone and cartilage