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Table 2 First-order grey-scale statistics of m. vastus lateralis. M. vastus lateralis 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
  Middle Proximal Distal Medial Lateral Middle Proximal Distal Medial Lateral
Mean 52.1 53.0 51.1 52.3 53.6 50.6 52.4 52.9 53.1 52.3
  (39.1–68.2) (42.0–61.9) (39.0–61.4) (37.9–61.1) (41.1–65.5) (42.7–57.2) (42.4–58.5) (38.5–66.2) (38.9–69.7) (39.4-64.2)
  [42.7–60.5] [44.6–59.9] [42.9–57.6] [45.2–58.7] [44.1–60.5] [45.5–54.7] [48.6–57.5] [46.7–57.5] [46.2–60.1] [46.6–60.3]
Variance 381.6 410.4 403.7 414.4 399.1 403.4 418.0 396.8 394.8 397.7
  (299.3–513.5) (331.7–503.2) (3227–487.0) (314.6–543.2) (294.7–566.9) (361.0–473.3) (327.3–480.5) (320.6–501.1) (330.7–486.2) (301.7–521.0)
  [326.3–400.8] [363.5–453.4] [358.2–447.3] [366.9–456.8] [350.8–438.5] [366.4–435.5] [393.6–456.4] [368.8–425.1] [360.7–424.5] [326.8–460.2]
Skewness 0.7 0.7 0.8 0.8 0.6 0.9 0.8 0.7 0.7 0.8
  (0.2–1.3) (0.3–1.1) (0.4–1.0) (0.5–1.1) (0.4–1.0) (0.5–1.1) (0.6–1.3) (0.4–1.1) (0.3–1.1) (0.5–1.2)
  [0.5–1.0] [0.4–1.1] [0.6–0.9] [0.6–1.0] [0.4–0.8] [0.7–1.0] [0.6–1.1] [0.5–1.0] [0.6–0.9] [0.6–1.0]
Kurtosis 0.3 0.3 0.4 0.4 0.2 0.5 0.4 0.3 0.3 0.5
  (-0.6–1.8) (-0.7–1.3) (-0.3–1.0) (-0.2–1.6) (-0.4–1.2) (-0.2–1.1) (-0.2–1.6) (-0.3–1.2) (-0.6–1.2) (-0.2–1.7)
  [-0.3–1.1] [-0.4–1.1] [-0.2–0.9] [-0.1–1.0] [-0.4–0.6] [0.1–0.8] [-0.1–1.0] [-0.1–0.9] [0.0–0.7] [-0.1–1.0]
Median 49.4 49.9 47.8 49.0 50.8 46.6 48.3 49.7 49.9 49.1
  (36.0–68.0) (37.0–61.0) (36.0–59.0) (35.0–57.0) (38.0–64.0) (37.0–54.0) (37.0–54.0) (34.0–65.0) (35.0–68.0) (35.0–62.0)
  [39.25–58.5] [41.0–57.8] [38.8–53.8] [41.3–56.0] [40.3–57.8] [41.0–51.0] [44.0–54.0] [42.5–54.5] [43.0–57.0] [42.5–57.5]