The pregnancy and implantation rates were statistically significantly lower in the less-acidic recombinant FSH alone group than in the combined sequential acidic hFSH/less-acidic recombinant FSH , and acidic hFSH alone groups ( 33.3 % , 43.5 % , 39 % and 17.3 % , 24.5 % , 20.4 % , respectively ) .
