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Table 1 Cross-sectional analysis: special cause variation in Observed and Risk-Adjusted mortality rates for coronary artery bypass grafting surgery 1994 to 2003 in New York hospitals.

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)

2

4

0

6

Common cause variation

0

281

6

287

Special cause variation (high)

0

3

2

5

Total

2

288

8

298