Table 3. Average Number of Conditions Reported per Death Certificate at Intervention and Nonintervention Hospitals, New York City, 2009–2011.
| Variable | Jan–Jun 2009 | Jan–Jun 2010 | Change 2009–2010 | P Valuea | Jan-Jun 2011 | Change 2009-2011 | P Valuea |
|---|---|---|---|---|---|---|---|
| Intervention hospitals | 2.35 | 3.39 | 1.04 | <.001 | 3.38 | 1.03 | <.001 |
| Hospital 1 | 2.28 | 3.33 | 1.05 | <.001 | 3.48 | 1.20 | <.001 |
| Hospital 2 | 1.87 | 2.95 | 1.08 | <.001 | 3.17 | 1.30 | <.001 |
| Hospital 3 | 2.41 | 3.74 | 1.33 | <.001 | 3.66 | 1.25 | <.001 |
| Hospital 4 | 2.58 | 3.53 | 0.95 | <.001 | 3.88 | 1.30 | <.001 |
| Hospital 5 | 2.52 | 3.39 | 0.87 | <.001 | 2.91 | 0.39 | <.001 |
| Hospital 6 | 2.42 | 3.16 | 0.74 | <.001 | 3.41 | 0.99 | <.001 |
| Hospital 7 | 2.50 | 3.67 | 1.17 | <.001 | 4.31 | 1.81 | <.001 |
| Hospital 8 | 1.52 | 2.76 | 1.24 | <.001 | 2.16 | 0.64 | <.001 |
| Nonintervention hospitals | 2.89 | 2.88 | −0.01 | .441 | 3.00 | 0.11 | <.001 |
| Citywide | 2.74 | 2.84 | 0.10 | <.001 | 2.93 | 0.19 | <.001 |
a P values calculated by using a 2-tailed test. All tests of difference use a standard normal approximation of the sampling distribution of the estimates with their associated z scores to test the null hypothesis of equal means.