TABLE 5 |.

R² and MAE Score for the ML predictions.

Model	R2 score (average ± SD)	MAE (average ± SD)
Pressure (Cubist)	0.958 ± 0.029	1.623 ± 0.191 mmHg
Pressure (XGBoost)	0.939 ± 0.067	1.544 ± 0.298 mmHg
Volume (Cubist)	0.942 ± 0.055	1.495 ± 0.260 ml
Volume (XGBoost)	0.923 ± 0.050	1.734 ± 0.584 ml
Myofiber stress (XGBoost)	0.971 ± 0.040	0.334 ± 0.228 kPa
Trans-myofiber stress (XGBoost)	0.936 ± 0.042	0.075 ± 0.024 kPa
Shear stress (XGBoost)	0.994 ± 0.006	0.050 ± 0.032 kPa

For each single cardiac cycle (pressure and volume) or LV (stress) test sample the error was calculated and then, the average and standard deviation was calculated for all test samples.