Table 4. Efficiency Indexes of Physician Organizations and Networks: Summary Statistics for the Boston Metropolitan Statistical Area (MSA), 2002.
| Organization and Network | Efficiency Indexes | |||
|---|---|---|---|---|
|
| ||||
| Unadjusted | Adjustments | |||
|
| ||||
| Case Mix | Case Mix and County | Case Mix, County, and Hospital Add-Ons1 | ||
| Boston MSA Average | 1.00 | 1.00 | 1.00 | 1.00 |
| Large Organizations (N=30)2 | ||||
| Mean | 1.09 | 1.02 | 1.02 | 1.01 |
| High | 2.26 | 1.13 | 1.12 | 1.11 |
| Low | 0.69 | 0.81 | 0.88 | 0.90 |
| Range | 1.57 | 0.32 | 0.24 | 0.21 |
| Percent Reduction in Range3 | — | 80 | 85 | 87 |
| Standard Deviation | 0.326 | 0.082 | 0.061 | 0.051 |
| Number of Indexes ≠ 1.004 | 18 | 9 | 4 | 4 |
| Networks (N=4) | ||||
| Mean | 1.11 | 1.05 | 1.04 | 1.03 |
| High | 1.31 | 1.10 | 1.08 | 1.06 |
| Low | 0.90 | 1.01 | 1.00 | 1.01 |
| Range | 0.41 | 0.09 | 0.08 | 0.05 |
| Percent Reduction in Range3 | — | 78 | 80 | 88 |
| Standard Deviation | 0.173 | 0.044 | 0.041 | 0.022 |
| Number of Indexes ≠ 1.004 | 4 | 2 | 1 | 1 |
1
Hospital add-ons are indirect medical education and disproportionate share payments.
2
Organizations with 2,000 or more assigned Medicare patients.
3
Relative to the unadjusted index.
4
Number of efficiency indexes statistically significantly different from 1.00 at the 1 percent level of significance.
SOURCE: Pope, G.C. and Kautter, J., RTI International, Waltham, MA.