FIGURE 3 Changes in LVEF before and after surgery in patients
with and without contractile reserve (CR).
In the box and whisker plots, the lines across each box represent the
median LVEF; the box represents the interquartile range
(25th–75th percentile) and the I
bars represent the 95% confidence intervals.
CR, contractile reserve; LVEF, left ventricular ejection fraction.