The intention-to-treat ( ITT ) and per-protocol ( PP ) H.pylori eradication rates were 83.8 % ( 67/80 ) and 88.2 % ( 67/76 ) in the furazolidone-based quadruple group , and 69.7 % ( 53/76 ) and 73.6 % ( 53/72 ) in the levofloxacin-based quadruple group respectively ( ( 2 ) = 4.311 , 5.100 ; P = 0.038 , 0.024 ) .