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Table 2 Comparison of global longitudinal strain measurements between CMR-FT and STE using Pearson’s correlation co-efficient, Intraclass correlation co-efficients, and Bland Altman analysis

From: Direct comparison of multilayer left ventricular global longitudinal strain using CMR feature tracking and speckle tracking echocardiography

Strain CMR-FT STE r ICC Bias LOA P-value
Endocardial − 15.31 ± 4.1 − 17.10 ± 4.2 0.685 0.626 − 1.79  ± 6.4 0.585
Weighted endocardial − 15.31 ± 4.1 − 16.41 ± 4.0 0.686 0.663 − 1.00  ± 6.2 0.780
Whole layer − 14.33 ± 3.9 − 15.15 ± 3.7 0.687 0.671 − 0.80  ± 5.9 0.219
Epicardial − 14.24 ± 3.6 − 13.26 ± 3.2 0.660 0.632 0.98  ± 5.5 0.055
Weighted epicardial − 14.24 ± 3.6 − 13.85 ± 3.4 0.661 0.657 0.39  ± 5.6 0.252
  1. For ICC values, all p < 0.001
  2. Key: bias = mean of differences between CMR-FT and STE measurements, r = Pearson’s correlation co-efficient (all p < 0.001), LOA = limits of agreement; 1.96 × standard deviation of the differences between the two measurements, p-value is that of linear regression on Bland Altman analysis