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