Quantitative evaluation of longitudinal strain in layer-specific myocardium during normal pregnancy in China

Table 5 Univariate relations (r coefficient and significance) of layer-specific strain components in the third trimester during pregnancy

Variable	Avg.GLS (P-value)	GLS-endo (P-value)	GLS-mid (P-value)	GLS-epi (P-value)
Gestation period(w)	0.385(P < 0.01)	0.290(P < 0.05)	0.472(P < 0.01)	0.487(P < 0.01)
Age(year)	0.368(P < 0.01)	0.291(P < 0.01)	0.372(P < 0.01)	0.473(P < 0.01)
BSA(m²)	0.510(P < 0.01)	0.610(P < 0.01)	0.479(P < 0.01)	0.388(P < 0.01)
LVEDd(mm)	0.275(P < 0.05)	0.223(P < 0.05)	0.263(P < 0.05)	0.337(P < 0.01)
RWT	0.308(P < 0.01)	0.284(P < 0.05)	0.342(P < 0.01)	0.281(P < 0.05)
Sphericity index	0.265(P < 0.05)	0.297(P < 0.01)	0.232(P < 0.05)	0.244(P < 0.05)
EF(%)	0.686(P < 0.01)	0.640(P < 0.01)	0.682(P < 0.01)	0.707(P < 0.01)

Abbreviations as in Tables 1, 2, and 3. Values of GLS, GCS, GRS and GAS considered as ‘positive’ (sign +) to build the univariate relations in order to homogenize the results of analyses and strengthen their clinical meaning: the higher the values, the better is the strain deformation independent of the plus/minus sign

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