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Table 1 First-order grey-scale statistics of m. supraspinatus. M. supraspinatus, dominant arm (D) and non-dominant arm (ND) for n = 9 healthy participants. Average values, (range), and [quartiles] are used for the average value of the 9 participants, whereas the mean, the variance, the skewness, the kurtosis, and the median are used to describe the distribution of the pixels in the individual ROI-images.

From: Quantitative ultrasound tissue characterization in shoulder and thigh muscles – a new approach

Grey-scale variables Longitudinal scans Transversal scans
  Medial Middle Lateral Medial Middle Lateral
  D ND D ND D ND D ND D ND D ND
Mean 32.5 34.2 36.2 33.9 33.8 33.5 31.6 36.6 34.5 35.2 31.0 33.6
  (18.7–44.2) (22.4–48.9) (22.5–47.6) (27.9–39.7) (20.0–47.3) (25.9–45.0) (25.5–38.5) (27.5–43.8) (19.4–42.6) (27.8–44.4) (17.6–39.0) (22.8–47.9)
  [28.6–38.2] [29.6–39.1] [32.0–40.9] [30.4–36.5] [27.3–39.6] [28.1–37.7] [27.6–37.2] [32.4–41.4] [30.7–40.1] [31.2–39.5] [27.0–35.4] [30.8–36.8]
Variance 167.0 165.0 250.2 252.3 284.9 293.8 190.3 191.1 246.7 256.9 282.7 258.7
  (116.0–213.5) (114.0–263.0) (128.1–403.8) (180.9–362.4) (207.8–363.1) (175.8–398.1) (106.9–354.8) (149.2–250.1) (175.6–345.6) (193.1–366.1) (182.8–380.0 (22.8–47.9)
  [133.3–200.0] [131.5–198.0] [217.6–280.7] [197.2–302.3] [236.6–334.7] [235.7–365.4] [139.4–238.6] [163.2–220.6] [184.9–287.6] [208.3–322.7] [232.2–336.2] [30.8–36.8]
Skewness 1.1 1.0 1.2 1.4 1.2 1.3 1.2 1.2 1.3 1.4 1.6 1.3
  (0.6–1.6) (0.6–2.1) (0.7–1.7) (0.9–2.3) (0.8–1.7) (1.1–1.7) (0.6–2.1) (0.8–1.7) (0.7–1.9) (1.0–1.9) (1.2–2.0) (0.6–2.1)
  [0.9–1.3] [0.7–1.1] [1.1–1.5] [1.0–1.6] [1.0–1.6] [1.2–1.5] [0.8–1.4] [1.0–1.2] [1.0–1.5] [1.1–1.8] [1.5–1.9] [1.0–1.6]
Kurtosis 2.0 1.6 2.3 2.6 1.9 2.3 2.3 2.1 2.3 3.1 3.6 2.4
  (0.4–3.9) (-0.2–7.2) (0.4–4.7) (0.8–6.7) (0.4–4.3) (1.3–3.9) (0.5–6.1) (0.6–5.4) (0.4–5.3) (0.8–5.3) (1.0–5.8) (-0.2–6.0)
  [0.9–3.2] [0.4–2.0] [1.2–3.4] [0.9–3.7] [0.9–3.1] [1.5–2.9] [1.0–3.3] [1.5–2.5] [0.9–3.3] [1.5–4.4] [2.7–4.9] [1.0–3.5]
Median 30.4 32.2 33.3 30.9 30.1 29.8 29.3 34.3 31.3 31.9 27.0 30.4
  (17.0–43.0) (20.0–47.0) (21.0–44.0) (25.0–36.0) (16.0–44.0) (22.0–41.0) (23.0–44.0) (26.0–40.0) (16.0–39.0) (25.0–40.0) (14.0–33.0) (20.0–44.0)
  [26.5–36.0] [28.0–37.5] [28.5–38.0] [27.5–33.0] [24.0–35.5] [25.0–33.5] [25.5–35.0] [30.5–39.0] [28.0–37.0] [28.0–36.0] [23.5–31.0] [27.5–33.0]