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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]