What proportion of patients with a flow rate of more than 15mls/sec are obstructed.. 30%

What proportion of patients with a flow rate of more than 15mls/sec are obstructed?

A- 25%
B- 30%***
C- 35%
D- 65%
E- 40%

Answer B:

<10mls 10-15mls="" 65="" 90="" obstructed="" sec="">15mls/sec 30%