Mid-term outcomes of off-pump versus on-pump coronary artery bypass graft surgery; statistical challenges in comparison

Table 2 Standardized mean differences (SMD) percentage of characteristic variables

	Unadjusted	PSM	IPW
eGFR	0.04	0.012	0.042
Age	0.045	0.015	0.055
Hb	0.094	0.037	0.062
Gender	0.015	0.012	0.015
Dyslipidemia	0.027	0.015	0.036
Diabetes	0.045	0.029	0.039
Hypertension	0.02	0.024	0.005
Positive family history	0.049	0.008	0.036
Opium	0.067	0.039	0.044
Current cigarette smoker	0.077	0.002	0.053
EF	0.097	0.003	0.059
Left main stenosis	0.007	0.005	0.012
Pre surgery PCI	0.107	0.054	0.045
BMI	0.014	0.002	0.006
Urgent operation	0.049	0.008	0.034
COPD	0.046	0.012	0.006
Cerebrovascular accident	0.018	0.052	0.027
Previous myocardial infarction (≤ 7 days)	0.109	0.01	0.012
Previous myocardial infarction (8–21 days)	0.122	0.043	0.075
Previous myocardial infarction (> 21 days)	0.011	0.016	0
Graft number	0.907	0.001	0.589

ISSN: 1471-2261