Table 4 Covariate balance of independent variables for the propensity scores between unmatched and matched data sets

Nosocomial infection

20.49

0.00

Trauma

12.60

10.78

Surgical operation

23.56

0.00

Immunosuppressive agents

15.43

10.73

Prior exposure to third-generation cephalosporins

11.91

3.41

Prior exposure to fluoroquinolones

12.36

10.94

Prior exposure to glycopeptides

14.06

18.14

CR-BSI

33.30

0.00

Pneumonia

18.07

5.60

Urinary tract infection

19.90

18.11

Severe sepsis or septic shock

15.05

15.58

Retention of foreign body

29.78

0.00

Infective endocarditis

15.25

18.11

Charlson’s comorbidity index

21.35

16.12

Pitt’s bacteremia score

13.35

11.08

Age

10.47

13.89

Vancomycin MICs

15.67

17.59