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Table 1 Descriptive data in the healthy control group showing normal ranges for each ultrasound domain in each muscle examined, presented as median, interquartile range, minimum and maximum values

From: Muscle shear wave elastography, conventional B mode and power doppler ultrasonography in healthy adults and patients with autoimmune inflammatory myopathies: a pilot cross-sectional study

  Median (IQR), Min-Max p- valuea (comparing medians)
  Age < 50 Age ≥50  
Fascial Thickness (mm)    
 Deltoid 0.76(0.66–0.84)0.50–0.92 0.72(0.64–0.76)0.48–0.90 0.123
 Vastus Lateralis 0.80(0.68–0.92)0.64 -1.00 0.86(0.70–0.93)0.50-1.00 0.627
 Tibialis Anterior 0.59(0.50–0.70)0.48–0.72 0.61(0.56–0.71)0.52–0.72 0.477
 Flexor Digitorum Profundus 0.54(0.48–0.63)0.42–0.70 0.59(0.52–0.64)0.46–0.68 0.329
 Flexor Carpi Ulnaris 0.60(0.56–0.64)0.36–0.74 0.55(0.48–0.72)0.37–0.80 0.451
Muscle Bulk (mm)    
 Deltoid 19.80(14.40–22.20)9.40–27.3 17.30(15.88–19.35)11.4–27.1 0.354
 Vastus Lateralis 20.15(17.20–2150)13.2–25.3 17.60(14.28–22.65)13.1–24.4 0.377
 Flexor Digitorum Profundus 10.55(9.20–11.30)8.30–15.2 12.60(9.28–14.90)8.00-17.1 0.252
Shear Wave Speed (m/s)    
 Deltoid (rest) 2.31(1.94–2.55)1.58–2.83 2.14(1.79–2.47)1.36–2.85 0.652
 Deltoid (Stretch) 2.80(2.37–3.24)1.65–4.68 2.47(2.18–2.63)1.72–2.97 0.333
 Vastus Lateralis (Rest) 1.70(1.63–1.75)1.59–3.34 1.74(1.57–1.97)1.34–2.08 0.747
 Vastus Lateralis (Stretch) 1.79(1.70–1.97)1.47–3.08 1.90(1.81–2.04)1.62–2.43 0.270
Echogenicity (1–4)    P valueb (comparing medians)
 Deltoid 1(1,1)1–3  1 (1,1)1–3 0.553
 Vastus Lateralis 1(1, 1)1–2  1(1–2)1–3 0.451
 Flexor digitorum profundus 1(1,1) 1–1  1 (1,1) 1–2 0.533
 Flexor carpi ulnaris 1(1–1)1–1 1 (1,1) 1-1 0.747
 Tibialis anterior 1(1–1)1–2  1 (1,2)1–2 0.331
Power Doppler (0–4)    P value b (comparing medians)
 Deltoid 0 (0–1) 0–2  0 (0,0) 0–2 0.134
 Vastus Lateralis 1 (0,1) 0–1  1(0–1) 0–2 0.949
 Flexor Digitorum Profundus 0 (0,1) 0–2  1(0–1) 0–2 0.477
 Flexor Carpi Ulnaris 1 (0,1) 0–3  1(0–1) 0–4 0.533
 Tibialis Anterior 1 (0,1) 0–1  1(0–1) 0–2 0.252
  1. IQR interquartile range, min-max: minimum-maximum, P valuea: Mann-Whitney test, P valueb: Fisher Exact Test