METHODS	One hundred and ninety-eight patients with IBS and syndrome of stagnation of qi and cold were randomly divided into high-dose Dinggui Oil group ( DGO-H , 1.2 g , 3 times daily ; n = 66 ) , low-dose Dinggui Oil group ( DGO-L , 0.8 g , 3 times daily , n = 66 ) , and placebo group ( placebo , 5.0 g , 3 times daily , n = 66 ) .\