A protocol-defined relapse was defined as new or recurrent neurologic symptoms not associated with fever or infection that lasted at least 24 hours, and were separated by at least 30 days from onset of a preceding relapse. All protocol-defined relapses were evaluated by an independent neurologic evaluation committee.

The adjusted annualized relapse rate was calculated from a negative binomial regression model , adjusted for baseline Expanded Disability Status Scale (EDSS ) score(≤2.0 versus>2.0), age (<40 versus ≥40 years), region, and the number of relapses in the 1 year prior to enrollment.

The intent-to-treat (ITT) population was defined as all subjects who were randomized and received at least 1 dose of study treatment. Among subjects who switched to an alternative therapy for multiple sclerosis, all the data before the switch were used for the analysis. In all other subjects, all relapses were included in the analysis.

The number of new or newly enlarging T2 hyperintense lesions at 2 years that developed in each subject compared to baseline assessed on brain magnetic resonance imaging (MRI) scans. The estimates of mean T2 hyperintense lesion count were calculated from a negative binomial regression model adjusted for region and baseline T2 hyperintense lesion volume.

Of the 681 subjects in the MRI cohort, 572 (139 placebo, 140 BG00012 BID, 140 BG00012 TID, 153 GA) had post-baseline T2 hyperintense data & were included in the analysis. Missing data before the use of alternative MS medications & visits after subjects switched to alternative MS medications were imputed with the use of a constant rate assumption.

The number of new T1 hypointense lesions at 2 years that developed in each subject compared to baseline assessed on brain magnetic resonance imaging (MRI) scans. The estimates of mean T1 hypointense lesion count were calculated from a negative binomial regression model adjusted for region and baseline T1 hypointense lesion volume.

Of the 681 subjects in the MRI cohort, 573 (139 placebo,140 BG00012 BID,140 BG00012 TID,154 GA) had post-baseline new T1 hypointense data & were included in the analysis. Missing data before the use of alternative MS medications & visits after subjects switched to alternative MS medications were imputed with the use of a constant rate assumption

A protocol-defined relapse was defined as new or recurrent neurologic symptoms not associated with fever or infection that lasted at least 24 hours, and were separated by at least 30 days from onset of a preceding relapse. All protocol-defined relapses were evaluated by an independent neurologic evaluation committee. The proportion of subjects with a relapse was estimated using the Kaplan-Meier method, which was based on the time-to-first-relapse survival distribution.

The analysis was based on the ITT population, defined as all subjects who were randomized and received at least 1 dose of study treatment. Among subjects who switched to an alternative therapy for MS, all the data before the switch were used for the analysis. In all other subjects, all relapses were included in the analysis.

EDSS is based on a standardized neurological exam and focuses on symptoms that commonly occur in MS. Scores range from 0.0 (normal) to 10.0 (death due to MS). Disability progression was defined as ≥ 1.0 point increase in subjects with a baseline EDSS of ≥1.0, or ≥1.5 point increase in subjects with a baseline EDSS=0, and required that the increase from baseline was confirmed ≥ 12weeks later. The proportion of subjects with confirmed (12-week) disability progression was estimated using the Kaplan-Meier method, which was based on the time-to-first-progression survival distribution

The analysis population consisted of the intent-to-treat (ITT) population (all subjects who were randomized and received at least 1 dose of study treatment) who had a baseline EDSS assessment. Analyses were based on all observed data. Onset of disability progression must begin before a subject switched to alternative MS medication.