TABLE 2.
Lift Chart Metrics
| Internal validation (NIS) | ||||||||||
| Decile | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Predicted mean LOS, d | 4.1 | 4.5 | 4.8 | 5.5 | 6.7 | 7.8 | 8.3 | 9.3 | 10.9 | 16.2 |
| Actual mean LOS, d | 4.2 | 4.3 | 4.6 | 5.0 | 6.8 | 7.6 | 8.5 | 9.8 | 11.0 | 16.7 |
| % difference |
 1.4 |
4.6 | 4.3 | 9.1 |
 1.9 |
2.2 |
 1.8 |
 4.8 |
 1.1 |
 3.2 |
| External validation (NSQIP) | ||||||||||
| Decile | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Predicted mean LOS, d | 3.8 | 4.4 | 4.6 | 5.0 | 5.6 | 6.5 | 7.7 | 8.5 | 9.6 | 12.6 |
| Actual mean LOS, d | 4.0 | 3.9 | 4.2 | 5.1 | 5.4 | 6.0 | 6.9 | 8.8 | 9.6 | 11.5 |
| % difference |
 5.3 |
10.7 | 11.0 |
 2.0 |
4.8 | 9.5 | 10.8 |
 2.8 |
 0.5 |
9.4 |
Description of lift chart metrics. The predicted length of stay for the internal and external validation are divided into deciles and the means calculated. This is compared to the mean for actual length of stay. LOS, length of stay; d, days.