Table 1 Operators’ characteristics and study measurements

Number of trainees (N)

28

Number of expert ultrasonographers (N)

2

Years of experience, mean ± SD

2.6 ± 2.0

Post-graduate year in training, mean ± SD

4.6 ± 1.4

Previous general US training (%)

44.4

Heart rate, mean ± SD

65.8 ± 5.0

VTI-auto (cm), mean ± SD

14.8 ± 2.0

VTI-mnl-trainee (cm), mean ± SD

15.2 ± 2.4

VTI-mnl exp (cm), mean ± SD

16.7 ± 1.9

LVOT-mnl-trainee (cm), mean ± SD

2.4 ± 0.2

LVOT-mnl-exp (cm), mean ± SD

2.5 ± 0.4

CO-auto (L/min), mean ± SD

4.5 ± 1.2

CO-mnl-trainee (L/min), mean ± SD

4.6 ± 1.0

CO-mnl-exp (L/min), mean ± SD

5.7 ± 2.5