Table 3.
Variation in STAT category case-mix across centers
| Center-level percentiles for proportion of total case volume comprised of specified STAT categories |
Magnitude of variation across centers |
|||||
|---|---|---|---|---|---|---|
| STAT Category | 10th % | 25th % | 50th % (median) |
75th % | 90th % | Ratio 90th%/10th% |
| 1 | 24.9% | 29.0% | 32.0% | 36.8% | 41.2% | 1.7 |
| 2 | 26.1% | 29.2% | 33.1% | 36.0% | 38.8% | 1.5 |
| 3 | 7.4% | 9.0% | 11.3% | 12.9% | 14.6% | 2.0 |
| 4 | 14.1% | 16.4% | 19.2% | 22.1% | 25.7% | 1.8 |
| 5 | 0.8% | 2.8% | 4.0% | 5.2% | 6.2% | 7.9 |
The proportion of a center’s total case volume comprised of various STAT categories and distribution across centers is displayed. The magnitude of variation across centers is described by the ratio of the 90th/10th percentile (excluding extreme outliers). For example, the proportion of total cases comprised of STAT 5 cases ranged from 0.8% (10th percentile) to 6.2% (90th percentile), or 7.9-fold variation across centers.