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Table 2 Results of pre and post-standardization analyses

From: Towards standardized postprocessing of global longitudinal strain by feature tracking – OptiStrain CMR-FT study

All subjects Pre-Standardization Post-Standardization Sig. (p-value)
GLS Medis    
 Mean ± SD 16.9 ± 5.5 17.4 ± 2.7 0.32
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.3 ± 2.1 0.1 ± 1.1 0.23 ± 0.7 −0.51 ± 1.9
 CV (%) 7.2 11 3.1 5.2
 ICC 0.979 0.914 0.996 0.98
GLS CVI42
 Mean ± SD 19.0 ± 4.5 19.0 ± 3.9 0.98
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.7 ± 2.3 −0.3 ± 1.3 − 0.2 ± 0.7 − 0.3 ± 1.1
 CV (%) 4.6 4.7 4.3 4.4
 ICC 0.978 0.964 0.995 0.993
Controls Pre-Standardization Post-Standardization Sig. (p-value)
GLS Medis
 Mean ± SD 19.8 ± 5.3 20.71 ± 2.21 0.24
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.9 ± 3.5 −0.4 ± 2.6 0.5 ± 1.1 0.51 ± 1.1
 CV (%) 3.8 6.5 2.2 2.2
 ICC 0.88 0.85 0.96 0.92
GLS CVI42
 Mean ± SD 24.1 ± 5.2 23.51 ± 2.8 0.58
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.7 ± 2.4 −0.6 ± 3.5 −0.7 ± 1.1 −1.2 ± 2.4
 CV (%) 3.4 5.8 1.6 2.0
 ICC 0.85 0.79 0.96 0.93
IHD Pre-Standardization Post-Standardization Sig. (p-value)
GLS Medis
 Mean ± SD 16.2 ± 4.4 18.3 ± 2.2 0.45
 Cohen D 0.74 1.09   
  IntraOB InterOB IntraOB InterOB
 MD ± SD −0.4 ± 2.7 0.3 ± 1.9 0.3 ± 0.7 0.3 ± 0.8
 CV (%) 6.8 7.6 2.3 3.2
 ICC 0.79 0.81 0.92 0.89
GLS CVI42
 Mean ± SD 19.4 ± 5.31 20.3 ± 3.9 0.63
 Cohen D 0.89 0.95   
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.8 ± 2.8 −0.5 ± 1.8 −0.4 ± 0.7 −0.5 ± 1.2
 CV (%) 3.5 3.6 1.8 2.4
 ICC 0.80 0.78 0.95 0.90
DCM Pre-Standardization Post-Standardization Sig. (p-value)
GLS Medis
 Mean ± SD 16.38 ± 3.42 15.9 ± 2.4 0.599
 Cohen D 0.77 2.09   
  IntraOB InterOB IntraOB InterOB
 MD ± SD −0.2 ± 1.2 −0.9 ± 3.2 0.3 ± 0.7 −0.8 ± 0.6
 CV (%) 6 3.5 2.3 1
 ICC 0.74 0.79 0.93 0.96
GLS CVI42
 Mean ± SD 17.7 ± 5.71 16.8 ± 2.2 0.26
 Cohen D 1.17 2.67   
  IntraOB InterOB IntraOB InterOB   
 MD ± SD −0.6 ± 2.1 −0.3 ± 1.1 −0.5 ± 0.6 −0.4 ± 0.9
 CV (%) 3.5 3.6 1.3 2.3
 ICC 0.78 0.75 0.95 0.93
  1. IHD Ischaemic heart disease, DCM Dilated cardiomyopathy, GLS Global longitudinal strain, MD Mean differences, SD Standard deviation, paired and unpaired t-test for repeated measurements and the differences between the group, *p < 0.05 is considered significant