Table 5 Model discrimination by harrell’s concordance index.

From: Feasibility, accuracy and prognostic value of fully automated speckle tracking analysis-derived left ventricular ejection fraction and global longitudinal strain

Model

χ2 (df)

p (χ2)

C-index (se)

ΔC

p (ΔC)

Baseline (Age, NYHA, CCI)

  

0.736 (0.036)

  

+ LVEF (vs. baseline)

13.59 (1)

< 0.001

0.764 (0.032)

0.027

0.163

+ LVGLS (vs. baseline)

13.78 (1)

< 0.001

0.770 (0.031)

0.033

0.058

+ LVEF + LVGLS (vs. baseline)

14.63 (2)

< 0.001

0.768 (0.032)

0.032

0.093

LVGLS beyond LVEF

1.04 (1)

0.308

0.768 (0.032)

0.004

0.439

LVEF beyond LVGLS

0.85 (1)

0.356

0.768 (0.032)

-0.002

0.701

  1. CCI, Charlson Comorbidity index; LVEF, left ventricular ejection fraction; LVGLS; left ventricular global longitudinal strain; NYHA, New York heart association.
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