appendectomy
The logistic regression analysis showed that        appendectomy and tonsillectomy have no independent association with the risk of       developing ulcerative colitis, whereas in Crohn's disease both appendectomy and       tonsillectomy have positive associations.
The logistic regression analysis showed that         @SUBJECT$  and tonsillectomy have no independent  @PREDICAT$  with the risk of       developing  @OBJECT$ , whereas in Crohn's disease both appendectomy and       tonsillectomy have positive associations.