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Table 2 Covariate balance testing between unmatched and matched sample

From: Reduced 30-day mortality in men after elective coronary artery bypass surgery with minimized extracorporeal circulation-a propensity score analysis

Variable Standardized difference [%] % reduction |difference| p-value
  Unmatched Matched   Unmatched Matched
Age 8.1 0.1 98.3 0.03 0.97
No of grafts -21.5 3.9 82.1 < 0.001 0.37
LIMA use 17.6 0.7 96.0 < 0.001 0.86
ECC-timeA -38.3 1.4 96.5 < 0.001 0.72
Cross clamp time -26.9 3.3 87.8 < 0.001 0.42
Reperfusion time -39.4 -1.5 96.3 < 0.001 0.68
Body mass index 1.5 1.0 32.6 0.65 0.61
Body surface area -16.6 4.0 76.0 < 0.001 0.36
Hypertension 15.2 -1.4 90.6 < 0.001 0.74
  1. A ECC extracorporeal circulation