The mean portal pressure declined significantly in both groups , from 16 mmHg ( range , 12-28 mmHg ) to 13.5 mmHg ( range , 6-20 mmHg ) in the combination group ( P < 0.05 ) , and from 17 mmHg ( range , 12-27 mmHg ) to 14 mmHg ( range , 7-25 mmHg ) in the propranolol monotherapy group ( P < 0.05 ) .