At a multivariate logistic regression , middle ureteral stone ( OR 5.58 , p = 0.01 ) , distal ureteral stone ( OR 7.87 , p < 0.01 ) , LL ( OR 2.4 , p = 0.02 ) and HUs 1,200 ( OR 1.15 , p = 0.02 ) were significantly associated with a SF status .