Table 2.

Ratios of observed-to-expected (O–E) numbers of HPB procedures performed in each state during 2005–2011^a

States with an O–E ratio of <1		States with an O–E ratio of >1
State	O–E ratio	State	O–E ratio
Maine	0.05	Indiana	1.02
Wyoming	0.08	Maryland	1.04
North Dakota	0.10	West Virginia	1.07
South Dakota	0.17	Kentucky	1.12
Nebraska	0.22	California	1.17
Kansas	0.33	Florida	1.21
South Carolina	0.38	Connecticut	1.22
Michigan	0.41	Arizona	1.24
Georgia	0.43	New Jersey	1.28
New Mexico	0.44	Wisconsin	1.29
Texas	0.48	New York	1.30
Hawaii	0.50	Illinois	1.33
Arkansas	0.59	Colorado	1.40
Louisiana	0.64	Oregon	1.40
Iowa	0.66	Utah	1.46
Ohio	0.66	North Carolina	1.54
Montana	0.67	Vermont	1.57
Rhode Island	0.68	Missouri	1.66
Mississippi	0.69	New Hampshire	1.67
Virginia	0.69	Pennsylvania	1.83
Washington	0.70
Tennessee	0.71
Nevada	0.80
Massachusetts	0.84
Oklahoma	0.91
Minnesota	0.94

^aA ratio of 1 indicates that the number of procedures carried out is proportional to that state's population.