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. Author manuscript; available in PMC: 2012 Apr 10.
Published in final edited form as: Am J Manag Care. 2010 Feb;16(2):131–138.

Table 1.

Descriptive Statistics, Hospital Referral Region Levela

Spending Data Source 2006 Interquartile Range
(75%/25%)		 2006 Coefficient
of Variation		 1996-2006 Growth
Interquartile Range
(75%/25%)b 		1996-2006
Growth Coefficient
of Variationb
Medicare 1.22 0.16 1.50 0.34
Thomson Reuters 1.24c 0.21c 2.09 0.45
a

Medicare results were weighted by Medicare 5% sample size in hospital referral region (HRR) in 2006; Thomson Reuters results were weighted by member months in the Thomson Reuters sample in HRR in 2006..

b

Uses Thomson Reuters data for firms with data available for all years from 1996 to 2006; based on sample of 276 HRRs with at least 1500 member months of data in the Thomson Reuters data set in both 1996 and 2006. Data for Medicare are from the Dartmouth Atlas.

c

Uses Thomson Reuters MarketScan Research Databases for firms with data available for at least 5 years from 1996 to 2006; based on sample of all 306 HRRs

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