Accounting for the mortality benefit of drug-eluting stents in percutaneous coronary intervention: a comparison of methods in a retrospective cohort study

Table 2 Standardized Differences Between BMS and DES Patients Before and After Matching, April 1, 2003 - December 31, 2007

	Standardized Difference Prior to Match	Standardized Difference Post Match
N	(2,518 BMS, 19,101 DES)	(2,063 BMS, 2,063 DES)
Age (years)	-8.3	1.9
Male Sex (%)	-1.7	-6.2
Race/Ethnicity	-11.3	-5.8
Comorbidities (%)
Diabetes	9.1	3.5
Hypertension	7.5	-3.2
Prior MI	2.7	4.7
PCI Indication:	-21.6	0.2
Prior PCI	6.1	6.1
Prior CABG	2.5	2.5
Congestive Heart Failure	3.8	3.8
Prior Stroke	0.0	0.0
Peripheral Arterial Disease	1.9	1.9
Glomerular Filtration Rate	0.3	0.3
Systemic Malignancy	-13.4	0.4
Prior Gastrointestinal Bleeding	-4.2	-0.6
Chronic Lung Disease	-0.3	7.8
Medications
β-Blockers	11.9	-1.1
Clopidogrel	8.9	3.4
Statin	12.3	5.3
ACE-I/ARB	9.2	4.1
Warfarin	1.0	3.1

Abbreviations: MI, myocardial infarction; PCI, percutaneous coronary intervention; CABG, coronary artery bypass graft surgery.

ISSN: 1741-7015