Skip to main content

Table 1 Left Ventricle peak systolic strain and twist measurements obtained by speckle tracking echocardiography (STE), measurement error and coefficient of variation

From: Speckle tracking echocardiography in mature Irish Wolfhound dogs: technical feasibility, measurement error and reference intervals

 

Mean (SD)

[Reference interval]

Na

CIb95%

M. Errorc

CV%d

Peak apical systolic radial strain (%)

45.1 (10.4)

[24.3 to 65.9]

44

10.8

24.8

7.1

Peak apical circumferential strain (%)

24.8 (6.2)

[-12.8 to -38.5]

44

6.5

11.5

3.0

Peak basal systolic radial strain (%)

36.9 (14.7)

[7.5 to 66.3]

46

15.0

26.4

7.1

Peak basal circumferential strain (%)

15.9 (3.2)

[-22.3 to -9.5]

44

3.3

6.7

6.8

Peak longitudinal strain (%)

16.2 (3.0)

[-22.2 to -10.2]

46

3.0

9,0

5.4

Left ventricle torsion (degrees)

11.5 (5.1)

[1.3 to 21.7]

45

5.2

10.0

3.4

  1. a N, numbers of dogs.
  2. b CI, confidence interval (calculated as standard deviation of the observations times the square root of the ratio, 3 dividend by the number of observations).
  3. c M. Error, refers to the repeatability statistic. Measurement error has dimensions that are the same as those of the measurement it describes.
  4. d CV% Coefficient of variation. For clarity the absolute values for CV are given here.