Although the occurrence of any adverse event ( 21.7 vs 27.9 % ) and each individual type of adverse event were all lower in the LMWH group compared to UFH group ( 6.7 vs 11.5 % , 3.3 vs 9.8 % , and 15.0 vs 19.7 % for death , major hemorrhage , and any hemorrhage , respectively ) , the differences were not statistically significant .