Table 2.
Estimates of intra-rater reliability
| Reliability | N measurements | Thickness | Thickness change | ||||
|---|---|---|---|---|---|---|---|
| ICC (±95%CI) | SEM (mm) | SDD (mm) | ICC (±95%CI) | SEM (%) | SDD (%) | ||
| Intra-rater 2 | 1 | 0.95 (0.93–0.97) | 0.30 | 0.83 | 0.56 (0.30–0.74) | 15.36 | 42.57 |
| 2 (mean) | 0.97 (0.95–0.98) | 0.22 | 0.62 | 0.75 (0.52–0.87) | 10.99 | 30.47 | |
| 3 (mean) | 0.97 (0.95–0.98) | 0.22 | 0.62 | 0.81 (0.65–0.90) | 9.06 | 25.12 | |
| Intra-rater 5 | 1 | 0.86 (0.75–0.92) | 0.48 | 1.34 | 0.34 (−0.96–0.67) | 18.91 | 52.43 |
| 2 (mean) | 0.96 (0.93–0.98) | 0.25 | 0.68 | 0.71 (0.30–0.89) | 10.47 | 29.01 | |
| 3 (mean) | 0.97 (0.95–0.99) | 0.22 | 0.60 | 0.84 (0.60–0.94) | 7.28 | 20.18 | |
Presented are intraclass correlation coefficient (ICC: ±95% confidence interval; models: 2,1 for single measurements 2,2 for two repeated measurements, and 2,3 for three repeated measurements), standard error of measurement (SEM) and smallest detectable difference (SDD). Intra-rater reliability 2 describes reliability of measurements performed with a 2-day break (i.e. Monday–Wednesday, Wednesday–Friday); intra-rater reliability 5 describes reliability of measurements performed with a 5-day break (i.e. Monday–Friday) (see Fig. 1)