Similarly , low-density lipoprotein cholesterol decreased significantly ( WMD : -5.13 [ 95 % CI : -9.46 , -0.81 ) ; P = 0.022 ) in the high-onion group , and ( WMD : -2.90 [ 95 % CI -5.57 , -0.21 ] ; P = 0.035 ) in the low-onion group after treatment .