Figure 2
Interobserver and intraobserver variability for measurement of global and segmental peak systolic circumferential strain (εcc) using local sine-wave modelling (SinMod) and harmonic phase (HARP) analysis methods. Variability (calculated as 1 - intraclass correlation coefficient [ICC]) is greater for segmental εcc measurements than for global strain measurements using both techniques. SinMod had significantly lower intraobserver variability than HARP for measurement of global εcc. SinMod also had significantly lower inter- and intraobserver variability than HARP for pooled segmental εcc measurements. Ant - anterior segment, AntLat - anterolateral segment, InfLat - inferolateral segment, Inf - inferior segment, InfSep - inferoseptal segment, AntSep - anteroseptal segment, Pooled - pooled segmental analysis. * denotes a significant difference, assessed using a Wilcoxon rank comparison of the squared differences (p<0.05).