RESULTS	The change in LDL-cholesterol was significantly greater in subjects in the upper and intermediate tertiles of basal plasma sitosterol concentrations ( -21 + / -8 mg/dl , P = 0.03 ; -19 + / -7 mg/dl , P = 0.04 , respectively ) than in subjects in the lower tertile ( 8 + / -5 mg/dl ) when they changed from a low cholesterol diet to a low cholesterol plus plant sterol diet .\