Table 2.
Inter-observer and intra-observer variability of elastography
| Study | Type | No. of nodules | Statistical method | Inter-observer statistical value | Intra-observer statistical value |
|---|---|---|---|---|---|
| Park et al. [90], 2009 | ES | 52 | Spearman correlation coefficient | 0.08-0.22 | - |
| Ragazzoni et al. [87], 2012 | ES | 132 | Cohen kappa statistic | 0.64 | - |
| Kim et al. [92], 2012 | ES | 99 | Cohen kappa statistic | 0.738 | 0.765 |
| Calvete et al. [94], 2013 | ES | 89 | Cohen kappa statistic | 0.838 | - |
| Cantisani et al. [88], 2014 | SR | 344 | Cohen kappa statistic | 0.95 | - |
| Lim et al. [91], 2012 | ECI | 56 | Pearson correlation coefficient | 0.73, 0.77, 0.79 | 0.73, 0.84, 0.87 |
| Cho et al. [17], 2017 | ECI | 173 | Intraclass correlation coefficient | 0.96 | 0.97, 0.98 |
| Zhang et al. [21], 2012 | pSWE | 173 | Intraclass correlation coefficient | 0.86 | 0.90 |
| Grazhdani et al. [95], 2014 | pSWE | 82 | Intraclass correlation coefficient | 0.75 | - |
| Friedrich-Rust et al. [93], 2012 | pSWE | 56 | Spearman correlation coefficient | - | 0.82 |
| Hofauer et al. [89], 2016 | pSWE | 10 | Intraclass correlation coefficient | 0.50 | 0.640, 0.740 |
| Veyrieres et al. [44], 2012 | 2-D SWE | 102 | Intraclass correlation coefficient | 0.97 | - |
| Zhou et al. [23], 2017 | 2-D SWE | 302 | Intraclass correlation coefficient | 0.813 | 0.905 |
ES, elasticity score; SR, strain ratio; ECI, elasticity contrast index; pSWE, point shear-wave elastography; 2-D SWE, 2-dimensional shear-wave elastography.