Variable

Before IPTW weighting

After IPTW weighting


Levosimendan (n = 87)

Milrinone (n = 117)

Standardized difference

P value*

Standardized difference

P value**


Euroscore II

3.81

2.12

0.35

0.02

0.17

0.86

NYHA category

2.59

2.30

0.37

0.009

0.22

0.49

LV ejection fraction

0.61

0.64

− 0.28

0.05

− 0.08

0.59

LV dilatation

0.09

0.12

− 0.09

0.52

− 0.07

0.63

RV function altered

0.39

0.21

0.33

0.02

0.08

0.61

RV hypertroph

0.03

0.10

− 0.27

0.05

− 0.02

0.90

RV dilatation

0.57

0.56

0.02

0.90

0.13

0.47

CPB duration

183.23

114.60

0.97

< 0.001

− 0.05

0.82

 CPB cardiopulmonary bypass, IPTW inverse probability of treatment weighting, LV left ventricle, NYHA New York Heart Association, RV right ventricle
 *Estimated using a t test or a Mann–Whitney test, as appropriate
 **Estimated using a weighted regression model