Table 8.

The univariate and multivariate regression model results for right ventricle strain.

Variables	RVFWLS				RV4CLS
	R2	p Value	B Unstandardised	p Value	R2	p Value	B Unstandardised	p Value
Age	−0.42	<0.0001			−0.4	<0.0001	−0.45	<0.0001
BSA	−0.42	<0.0001	−9.655	<0.0001	−0.38	<0.0001
Sex	−0.35	<0.0001	−2.794	<0.0001	−0.32	<0.0001	−1.98	<0.0001
LV Mass	−0.24	0.002	0.048	<0.0001	−0.27	0.001
DDLV	−0.38	<0.0001			−0.34	<0.0001
EDV	−0.37	<0.0001			−0.34	<0.0001
SBP	−0.15	0.039
RV basal	−0.28	<0.0001			−0.28	<0.0001
RVDA	−0.32	<0.0001			−0.28	<0.0001
A Vel	0.22	0.004			−0.1	0.049
TAPSE	−0.2	0.01
LA Vol	−0.15				−0.21	0.008

RVFWLS: Right ventricle free wall longitudinal strain, RV4CLS: Right ventricle four-chamber longitudinal strain, R²: Determination coefficient, BSA: body surface area, LV: left ventricle, DDLV: end diastolic diameter of left ventricle, EDV: end diastolic volume, SBP: systolic blood pressure, RV: right ventricle, RVDA: right ventricle diastolic area, TAPSE: tricuspid annular plane systolic excursion, LA: left atrial. Variables that reached p-values < 0.01 in the univariate model and did not show collinearity with other variables (VIF < 5) were included in the multivariate model. In case of collinearity, the variable with the highest correlation coefficient was included in the multivariate model. If a variable included in the multivariate model did not reach statistical significance, it was excluded by backward steps. In the RVFWLS multivariate regression model, r = 0.540, R² = 0.291 and corrected R² = 0.276, p < 0.0001. In the RV4CLS multivariate regression model, r = 0.477, R² = 0.227 and corrected R² = 0.215, p < 0.0001. Bold values indicate p-values < 0.01.