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Table 4 Interobserver and intraobserver variability for global strain and synchrony parameters

From: Impact of surgical pulmonary valve replacement on ventricular strain and synchrony in patients with repaired tetralogy of Fallot: a cardiovascular magnetic resonance feature tracking study

Parameter Intraobserver (n = 10) Interobserver (n = 10)
Mean difference ± SD ICC Mean difference ± SD ICC
Left ventricle
 Circumferential – mid
 Global strain (%) 0.25 ± 1.3 0.96 0.30 ± 1.9 0.89
 Maximum difference T2P (ms) 12.5 ± 27.8 0.86 1.0 ± 38.5 0.82
 Cross-correlation delay (ms) 2.8 ± 21.9 0.83 14.6 ± 31.4 0.62
 Longitudinal
 Global strain (%) 0.33 ± 2.1 0.93 1.6 ± 3.7 0.75
 Maximum difference T2P (ms) 102.3 ± 145 0.80 40.0 ± 154 0.67
 Cross-correlation delay (ms) 25.0 ± 80.7 0.73 45.8 ± 107 0.65
Right ventricle
 Circumferential – mid
 Global strain (%) 0.40 ± 1.6 0.95 0.31 ± 2.0 0.88
 Maximum difference T2P (ms) 64.0 ± 126 0.82 90.6 ± 107.9 0.61
 Cross-correlation delay (ms) 104 ± 233 0.66 93.0 ± 230 0.59
 Longitudinal
 Global strain (%) 1.0 ± 2.8 0.85 2.6 ± 2.2 0.76
 Maximum difference T2P (ms) 146 ± 133 0.76 157 ± 158 0.66
 Cross-correlation delay (ms) 22.4 ± 85.9 0.64 42.1 ± 118 0.53
  1. ICC intraclass correlation coefficient, T2P time-to-peak, SD standard deviation