Starr-Edwards (Caged ball) 30 mm
Peak gradient:	12.2 ± 4.6 mmHg
Mean gradient:	6.99 ± 2.5 mmHg
Peak velocity:	1.7 ± 0.3 m/s
Pressure half-time:	125 ± 25 ms
Effective orifice area:	1.65 ± 0.4 cm2