From: Case-mix and the use of control charts in monitoring mortality rates after coronary artery bypass
Observed mortality rate | Risk Adjusted mortality rate | |||
---|---|---|---|---|
Special cause variation (low) | Common cause variation | Special cause variation (high) | Total | |
Special cause variation (low) | 6 | 2 | 0 | 8 |
Common cause variation | 0 | 250 | 6 | 256 |
Special cause variation (high) | 0 | 4 | 4 | 8 |
Total | 6 | 256 | 10 | 272 |