TABLE 6.
Between-Days, Intra-Examiner Procedural Reliability for L4/5 Multifidus Thickness Assessment.
| Younger Adults (n=30) | Examiner 1 | Examiner 2 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Day 1: mean thickness (SD) | Day 2: mean thickness (SD) | ICC (95% CI) | SEM | MDC | Day 1: mean thickness (SD) | Day 2: mean thickness (SD) | ICC (95% CI) | SEM | MDC (95%) | |
| resting* | 2.99 (0.44) | 2.91 (0.52) | .85 (.69, .93) | 0.19 | 0.52 | 2.94 (0.48) | 2.87 (0.52) | .94 (.87, .97) | 0.12 | 0.34 |
| during limb lift* | 3.75 (0.46) | 3.72 (0.50) | .90 (.81, .95) | 0.14 | 0.40 | 3.72 (0.47) | 3.67 (0.54) | .92 (.83, .96) | 0.14 | 0.39 |
| % thickness change† | 20.2 (6.0) | 29.5 (14.3) | .38 (−.15, .69) | 8.6 | 24.0 | 27.5 (10.2) | 28.7 (12.1) | .82 (.62, .91) | 4.6 | 12.9 |
| resting ALT* | 3.28 (0.50) | 3.21 (0.55) | .89 (.78, .95) | 0.17 | 0.47 | 3.29 (0.53) | 3.22 (0.60) | .94 (.88, .97) | 0.13 | 0.36 |
| during limb lift ALT* | 4.10 (0.50) | 4.08 (0.50) | .90 (.79, .95) | 0.16 | 0.44 | 4.13 (0.52) | 4.08 (0.62) | .91 (.82, .96) | 0.17 | 0.46 |
| % thickness change ALT† | 20.0 (5.1) | 28.7 (12.4) | .46 (−.11, .74) | 6.6 | 18.3 | 26.4 (9.7) | 28.0 (10.0) | .86 (.71, .93) | 3.7 | 10.3 |
|
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| Older Adults (n=28) | ||||||||||
|
| ||||||||||
| resting* | 3.34 (0.81) | 3.25 (0.68) | .92 (.83, .96) | 0.21 | 0.59 | 3.15 (0.69) | 3.19 (0.73) | .90 (.78, .95) | 0.22 | 0.62 |
| during limb lift* | 4.00 (0.82) | 3.93 (0.73) | .92 (.83, .96) | 0.22 | 0.61 | 3.88 (0.70) | 3.86 (0.69) | .92 (.82, .96) | 0.20 | 0.55 |
| % thickness change† | 21.1 (9.1) | 22.0 (10.9) | .78 (.52, .89) | 4.6 | 13.0 | 24.7 (12.3) | 22.7 (13.9) | .69 (.34, .86) | 4.0 | 11.1 |
| resting ALT* | 3.65 (0.80) | 3.66 (0.73) | .92 (.83, .96) | 0.22 | 0.60 | 3.48 (0.71) | 3.57 (0.82) | .89 (.76, .94) | 0.25 | 0.70 |
| during limb lift ALT* | 4.35 (0.83) | 4.40 (0.78) | .93 (.84, .96) | 0.21 | 0.59 | 4.27 (0.68) | 4.23 (0.78) | .91 (.82, .96) | 0.21 | 0.58 |
| % thickness change ALT† | 20.3 (7.53) | 21.3 (10.0) | .71 (.38, .86) | 4.3 | 11.9 | 24.5 (11.8) | 20.3 (12.8) | .72 (.40, .87) | 6.3 | 17.5 |
Abbreviations: ALT=alternate measurement technique; CI=confidence interval; ICC=intraclass correlation coefficient; MDC=minimal detectable change; SD=standard deviation; SEM=standard error of measurement.
*
Resting and limb lift means, standard deviations, SEMs, and MDCs are provided in centimeters.
†
Percent thickness change was calculated ((thickness during limb lift-resting thickness)/resting thickness)*100.