Does interhospital transfer improve outcome of acute myocardial infarction? A propensity score analysis from the Cardiovascular Cooperative Project

Table 3 Patient characteristics according to transfer status and hospital location in propensity matched groups

	Non-Transferred N = 44,175	Transferred N = 44,175		Urban N = 32,131	Rural N = 32,131
Continuous Variables
	Mean	Mean	p-value	Mean	Mean	p-value
Age	73.4	73.5	0.13	76.6	76.7	0.63
Charlson Score	0.56	0.55	0.17	0.68	0.68	0.59
Krumholz Predicted Mortality	0.14	0.15	<.01	0.18	0.18	0.60
APACHE Score	8.4	8.4	0.52	9.6	9.6	0.61
SBP on Admission	143	142	0.02	147	146	0.50
Creatinine on Admission	1.27	1.28	0.09	1.4	1.4	0.84
WBC on Admission	10.6	10.6	0.83	10.8	10.8	0.53
Categorical Variables
	%	%	p-value	%	%	p-value
Female	43	43	0.39	49	49	0.89
African American	4	4	0.24	5	5	0.83
Terminal Illness	0.2	0.2	0.83	0.3	0.4	0.89
Diabetes	30	29	<.01	31	31	0.73
Chronic Renal Insufficiency	3	3	0.77	4	4	0.93
Hypertension	61	61	0.59	59	59	0.67
Malignancy	2	2	0.79	3	3	0.05
History of Heart Failure	13	13	0.08	23	23	0.36
History of CAD	37	36	0.07	38	37	0.39
History of Acute MI	28	28	0.95	31	31	0.28
History of PCTA	9	8	0.33	5	5	0.91
History of Bypass Surgery	13	12	<.01	11	11	0.38
Shock on Admission	4	4	0.14	3	3	1.00
Cardiac Arrest	13	12	0.01	15	15	0.10
Heart Failure on Admission	38	38	0.90	46	46	0.98
Angina on Admission	3	3	0.06	3	3	0.73
Abnormal Rhythm on Admission	42	41	0.18	44	44	0.67
Anterior or Lateral MI	47	47	0.85	46	46	0.59

ISSN: 1471-2261