. Author manuscript; available in PMC: 2016 Aug 1.

Published in final edited form as: J Am Soc Echocardiogr. 2015 Apr 21;28(8):999–1008. doi: 10.1016/j.echo.2015.03.003

Table 4.

Comparison of speckle tracking-derived deformation parameters between controls and three subgroups of participants with DMD: 1) those with SF%>28 2) those younger than 13 years and 3) those with TDI MPI <0.40.

Group	SF%>28			Age<13 years			MPI<0.40
Measure	DMD, (n=26)	Controls (n=28)	P value	DMD, (n=17)	Controls (n=17)	P value	DMD, (n=22)	Controls (n=25)	P value
Measure	Mean (SD)	Mean (SD)	P value	Mean (SD)	Mean (SD)	P value	Mean (SD)	Mean (SD)	P value
LV Shortening Fraction (%)	34 (4)	38 (4)	<.001	34 (4)	38 (4)	.015	32 (5)	38 (4)	<.001
Average LV Longitudinal Strain (%)	−14.3 (3.6)	−17.8 (3.0)	<.001	−15.3 (3.6)	−17.6 (2.3)	.033	−14.5 (3.4)	−17.4 (3.0)	.003
Average LV Circumferential Strain (%)	−20.2 (4.6)	−25.5 (3.5)	<.001	−19.3 (3.9)	−25.9 (3.5)	<.001	−20.7 (5.1)	−25.7 (3.2)	<.001
Average LV Longitudinal Strain Rate (1/s)	−1.2 (.4)	−1.3 (.3)	.16	−1.2 (.3)	−1.3 (.2)	.07	−1.1 (.3)	−1.3 (.3)	.045
Average LV Circumferential Strain Rate (1/s)	−1.9 (.5)	−2.4 (.5)	.001	−1.9 (.5)	−2.3 (.5)	.013	−1.9 (.5)	−2.4 (.5)	.004

Abbreviations: DMD – Duchenne muscular dystrophy, SF% - percent shortening fraction, TDI – tissue Doppler imaging, MPI – myocardial performance index, SD – standard deviation, LV - left ventricle, NS - not significant, SD - standard deviation