Starr-Edwards (Caged ball) 32 mm
Peak gradient:	11.5 ± 4.2 mmHg
Mean gradient:	5.08 ± 2.5 mmHg
Peak velocity:	1.7 ± 0.3 m/s
Pressure half-time:	110 ± 25 ms
Effective orifice area:	1.98 ± 0.4 cm2