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Table 4 Comparison of background covariates between exposure groups in the unmatched and matched samples

From: Outcomes in ST-segment elevation myocardial infarction treated with primary percutaneous coronary intervention or pharmacoinvasive strategy in a Latin American country

Variable

Unmatched (U)

Mean

% bias

Matched (M)

Treated

Control

Male patient

U

0.88

0.92

− 15.2

 

M

0.91

0.86

15.3

Age in years

U

61.12

67.08

− 51.6

 

M

62.06

60.80

10.9

Anterior/septal/lateral localization

U

0.66

0.57

18.5

 

M

0.64

0.63

1.2

Initial TIMI

U

0.45

0.11

82.5

 

M

0.39

0.50

− 27.4

Total ischemia-to-reperfusion time

U

259.41

444.66

− 100

 

M

258.12

314.55

− 30.5

Time to first contact

U

115.45

161.87

− 36.3

 

M

118.74

117.21

1.2

Hypertension

U

0.44

0.49

− 9.9

 

M

0.45

0.63

− 37.4

Diabetes mellitus

U

0.27

0.18

20.7

 

M

0.25

0.39

− 33.7

Chronic kidney disease

U

0.05

0.07

− 5.8

 

M

0.06

0.09

− 12

Cardiac arrest

U

0.06

0.08

− 6.4

 

M

0.07

0.02

19.6