Standardized Mean Difference (95% Confidence interval) (%)
  Outcome measurement
MRI Echocardiography
LVEF 3.62 (0.71-6.53) 8.02 (5.28-10.77)
Heterogeneity I2=0% I2=45%
  Sham injection in the control group
  Yes No
LVEF 6.35 (2.29-10.40) 8.59 (6.49-10.69)
Heterogeneity I2=3% I2=79%
  Surgical methods
LVEF 4.97 (2.87-7.07) 10.30 (7.7-12.90)
Heterogeneity I2=0% not applicable
LVEF: Left Ventricular Ejection Fraction; MRI: Magnetic Resonance Imaging; CABG: Coronary Artery Bypass Graft; OPCAB: Off-Pump Coronary Artery Bypass Grafting
Table 3: Subgroup analyses examining the impact outcome measurement, blindness, and surgical methods.