Table 2 Mean measurements for LMM and ICC values for study objective 1–4
From: Reliability of diagnostic ultrasound in measuring the multifidus muscle
Objective 1 Interexaminer reliability of measuring LMM thickness using one still image | |||
|---|---|---|---|
Mean LLM thickness examiner 1 | Mean LLM thickness examiner 2 | ICC average | ICC individual |
27.9 mm ± 3.2 mm | 27.9 mm ± 3.2 mm | 0.999 (0.997-0.999) | 0.997 (0.994-0.999) |
Objective 2 Interexaminer reliability of measuring LMM contraction using two sets of still images. | |||
Mean relaxed LLM thickness examiner 1 (distance 1) | Mean relaxed LLM thickness examiner 2 (distance 1) | ICC average | ICC individual |
28.9 mm ± 6.4 mm | 29.0 mm ± 6.1 mm | 0.97 (0.94-0.99) | 0.95 (0.89-0.98) |
Mean contracted LLM thickness examiner 1 (distance 2) | Mean contracted LLM thickness examiner 2 (distance 2) | ICC average | ICC individual |
32.1 mm ± 7.0 mm | 32.0 mm ± 6.7 mm | 0.97 (0.94-0.99) | 0.95 (0.90-0.98) |
Distance 2–1 examiner 1 | Distance 2–1 examiner 1 | ICC average | ICC individual |
3.1 mm ± 2.2 mm | 3.0 mm ± 2.0 mm | 0.98 (0.96-0.99) | 0.97 (0.92-0.98) |
Objective 3 Intraexaminer reliabilty of measuring LMM contraction using 2 sets of still images taken on 2 different days. | |||
Mean relaxed LLM thickness (distance 1 day 1) | Mean relaxed LLM thickness (distance 1 day 2) | ICC average | ICC individual |
28.4 mm ± 5.3 mm | 28.4 mm ± 4.8 mm | 0.99 (0.97-0.99) | 0.97 (0.94-0-99) |
Mean contracted LLM thickness (distance 2 day 1) | Mean contracted LLM thickness (distance 2 day 2) | ICC average | ICC individual |
29.7 mm ± 6.0 mm | 29.6 mm ± 5.5 mm | 0.97 (0.93-0.99) | 0.94 (0.88-0.97) |
Distance 2–1 day 1 | Distance 2–1 day 2 | ICC average | ICC individual |
1.4 mm ± 1.7 mm | 1.3 mm ± 1.7 mm | 0.97 (0.93-0.99) | 0.94 (0.88-0.97) |
Objective 4 Measuring LMM contraction before and after a motor task on two sets of still images. | |||
Mean relaxed LLM thickness (distance 1 before task) | Mean contracted LLM thickness (distance 2 before task) | Mean relaxed LLM thickness (distance 1 after task) | Mean contracted LLM thickness (distance 2 after task) |
30.6 mm ± 5.5 mm | 34.1 mm ± 6.6 mm | 29.9 mm ± 5.3 mm | 34.6 mm ± 6.4 mm |
Distance 2–1 before | Distance 2–1 after | ICC average | ICC individual |
3.5 mm ± 2.6 mm | 3.5 mm ± 2.5 mm | 0.98 (0.97-0.99) | 0.97 (0.94-0.99) |