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Slide Presentation from the AHRQ 2007 Annual Conference

Table 1: Means, Standard Deviation and Sources of Variables, 1997 and 2004

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Variable	Data sources	1997 Mean	1997 Std. Dev.	2004 Mean	2004 Std. Dev
PSI-5 (per 1000 discharges)	Iowa SID, AHRQ	0.04	0.22	0.07	0.33
PSI-6 (per 1000 discharges)	Iowa SID, AHRQ	0.47	1.37	0.18	0.81
PSI-7 (per 1000 discharges)	Iowa SID, AHRQ	0.83	1.81	0.27	0.90
PSI-15 (per 1000 discharges)	Iowa SID, AHRQ	2.44	3.22	1.78	3.24
Composite PSI (per 1000 discharges)	Iowa SID, AHRQ	3.78	4.46	2.30	3.65
Critical access hospital (CAH)	IHA	0	0	0.74	0.44
CAHmv	IHA	0	0	0.62	0.43
%Medicare days	Iowa SID	66.68%	11.33%	65.71%	14.88%
%Medicaid days	Iowa SID	6.72%	4.49%	7.20%	4.72%
Hospital casemix	CMS	1.06	0.09	0.99	0.12
Market concentration (HHI)	Iowa SID	8,936	1,969	8,925	2,008
County per capita income	ARF	21,180	1,846	26,401	4,338
County population density	ARF	31.80	18.51	31.80	19.34