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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)