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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