TABLE 2.
Test–retest reliability for LM and IL muscle thickness and echogenicity
| Muscle | Thickness | Echogenicity | ||||||
|---|---|---|---|---|---|---|---|---|
| ICC3,3 | 95% CI | SEM | F | ICC3,3 | 95% CI | SEM | F | |
| LM assessor A | 0.89 | [0.45, 0.97] | 0.05 | 13.63 | 0.93 | [0.72, 0.98] | 0.13 | 12.51 |
| LM assessor B | 0.98 | [0.94, 0.99] | <0.01 | 57.34 | 0.95 | [0.82, 0.99] | 0.48 | 19.94 |
| IL assessor A | 0.50 | [0.00, 0.89] | 0.09 | 1.96 | 0.87 | [0.49, 0.97] | <0.01 | 6.92 |
| IL assessor B | 0.97 | [0.90, 0.99] | <0.01 | 33.72 | 0.83 | [0.37, 0.96] | 0.58 | 5.63 |
Abbreviations: CI, confidence interval; F, F‐statistic; ICC, intraclass correlation coefficient; IL, iliocostalis lumborum; LM, lumbar multifidus; SEM, standard error of measurement.