demographic and baseline characteristics were compared with the use of the χ 2 or Fisher ’ s exact test for categorical variables and with analysis of variance on van der Waerden normal scores for continuous variables. Th e statistical analysis plan stated that clinical response, clinical remission, and mucosal healing would be analyzed using logistic regression, and that last observation carried forward methodology would be used to handle missing data. At the request of regulatory authorities, the data were instead analyzed using the Cochran –M antel– H aenszel test and missing data were handled using worst case methodology as described below. A two-sided Cochran –M antel– H aenszel test with concurrent mesalamine use / non-use as strata was used to compare clinical response, clinical remission, and mucosal healing. Missing data were handled using a “ worst case” intentionto-treat analysis in which patients with any missing component of the Mayo Score were considered not to be in clinical response, clinical remission, or to have mucosal healing.