Table 1. Selected Characteristics of Intervention and Nonintervention Hospitals in 2008 in an Intervention to Improve Cause-of-Death Reporting in New York City Hospitals, 2009–2010.

Hospital	Deaths Per Year	% HD Deaths	Average No. of Conditionsa	% Non-Hispanic White	Average Age of Decedent, y
Hospital 1	801	78	2.3	78	75
Hospital 2	366	72	2.2	40	76
Hospital 3	540	71	2.4	73	79
Hospital 4	350	70	2.5	80	81
Hospital 5	445	67	2.4	61	74
Hospital 6	601	67	2.7	57	77
Hospital 7	297	66	1.7	91	76
Hospital 8	1,197	60	2.5	79	75
All intervention hospitals	4,597	68	2.4	71	76
All nonintervention hospitals	30,736	25	3.0	43	69
P valueb	NA	<.01c	<.01	<.01c	<.01

Abbreviations: HD, heart disease; NA, not applicable.

^a Based on entity axis codes, ICD-10 codes assigned to the conditions the physician wrote on the death certificate, processed according to the National Center for Health Statistics’ Mortality Medical Data System (MMDS) software algorithm (32).

^b P values calculated using 2-tailed test. All tests of difference use a standard normal approximation of the sampling distribution of the estimates with their associated z scores.

^c Pooled estimate of the hypothesized true proportion in the null hypothesis of no difference.