In the second phase , FBG decreased from 151.36 39.22 to 137.28 28.65 mg/dl ( -14 mg/dl ) and HbA1c decreased from 7.42 0.97 to 7.15 0.68 mg/dl ( -0.28 % , p = 0.013 and p = 0.033 , respectively ) in the pistachio group ( B ) .