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Figure 4 Incremental value of an E/e' ratio >15 in predicting all-cause mortality. The addition of left ventricular ejection fraction (LVEF), deceleration time (DT), and E/e' resulted in significant incremental improvements in the predictive value of a model including clinical variables (age, Killip class 2 on admission, anterior myocardial infarction, and myocardial revascularization during the index admission): chi-square = 20.8 with 4 degrees of freedom for clinical factors; chi-sqaure = 28.8 with 5 degrees of freedom for clinical factors plus LVEF; chi-square = 33.2 with 6 degrees of freedom for clinical factors plus LVEF plus DT 140 ms; and chi-square = 43.0 with 7 degrees of freedom for clinical factors plus LVEF plus DT 140 ms plus an E/e' ratio <15.