Table 2. Percentage of Death Certificates Reporting Heart Disease as Cause of Death at Intervention and Nonintervention Hospitals, New York City, 2009–2011.

Variable	Jan–Jun 2009, %	Jan–Jun 2010, %	Percentage Point Change 2009–2010	P Valuea	Jan-Jun 2011, %	Percentage Point Change 2009–2011	P Valuea
Intervention hospitals	68.8	32.4	−36.4	<.001	33.7	−35.1	<.001
Hospital 1	79.5	27.0	−52.4	<.001	23.5	−55.9	<.001
Hospital 2	70.5	34.1	−36.4	<.001	35.9	−34.6	<.001
Hospital 3	72.6	42.5	−30.1	<.001	44.3	−28.3	<.001
Hospital 4	72.8	45.0	−27.8	<.001	50.0	−22.8	<.001
Hospital 5	58.6	26.2	−32.4	<.001	26.1	−32.5	<.001
Hospital 6	68.2	36.9	−31.2	<.001	39.1	−29.1	<.001
Hospital 7	74.9	35.2	−39.8	<.001	33.8	−41.2	<.001
Hospital 8	58.9	25.9	−32.9	<.001	39.5	−19.4	.001
Nonintervention hospitals	26.6	24.4	−2.2	<.001	22.1	−4.5	<.001
Citywide	39.1	34.3	−4.8	<.001	32.5	−6.6	<.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 proportions with common variance estimated by pooled proportion.