Table 2.
Reliability and agreement statistics for ultrasound measures of thickness, thickness changes and differences in thickness changes over time
| Thickness | Thickness changes | Differences in thickness changes over time | |
|---|---|---|---|
| N (subjects) | 35 | 35 | 24 |
| N (images) | 840 | 420 | 288 |
| Single measure | |||
| ICC2,1 (95% CI) | Not applicable | 0.56 (0.49–0.62) | 0.31 (0.20–0.41) |
| Average of 2 measures | |||
| ICC2,1 (95% CI) | 0.97 (0.96–0.97) | 0.72 (0.65–0.77)a | 0.44 (0.33–0.58)a |
| SEM | 0.04 cm | 15% | 24% |
| SDC | 0.11 cm | 41.6% | 66.5% |
aAdjusted by using the Spearman–Brown formula
ICC Intraclass correlation coefficient, SEM standard error of the measurement, SDC smallest detectable change