ARR is defined as the number of confirmed relapses per year. A relapse is defined as the occurrence of an acute episode of one or more new symptoms, or worsening of existing symptoms of multiple sclerosis (MS), not associated with fever or infection, and lasting for at least 24 hours after a stable period of at least 30 days. A confirmed relapse is a relapse accompanied by an increase from the previous clinically stable assessment (that is, performed at least 30 days after the onset of any previous relapse) of at least 0.5 point in the Expanded Disability Status Scale (EDSS) score, or one point in the score for at least one of the Functional System (FS) scores, excluding the bowel and bladder, and mental FS. EDSS is ordinal clinical scale ranges 0 (normal neurological examination) to 10 (death due to MS).

Ponesimod analysis set (PAS) included all participants who received at least one dose of ponesimod at any time during the core and/or the extension study (435 participants).

Time to first confirmed relapse was reported. A relapse is defined as the occurrence of an acute episode of one or more new symptoms, or worsening of existing symptoms of multiple sclerosis (MS), not associated with fever or infection, and lasting for at least 24 hours after a stable period of at least 30 days. A confirmed relapse is a relapse accompanied by an increase from the previous clinically stable assessment (that is, performed at least 30 days after the onset of any previous relapse) of at least 0.5 point in the Expanded Disability Status Scale (EDSS) score, or one point in the score for at least one of the Functional System (FS) scores, excluding the bowel and bladder, and mental FS. EDSS is ordinal clinical scale ranges from 0 (normal neurological examination) to 10 (death due to MS).

PAS included all participants who received at least one dose of ponesimod at any time during the core and/or the extension study (435 participants).

Time to 24 weeks confirmed disability progression (accumulation) was reported. Disability progression is defined as an increase of at least 1 point in the EDSS score if baseline EDSS was between 1 and 5.0, an increase of at least 1.5 points if baseline EDSS was 0, or an increase of at least 0.5 points if the baseline EDSS was equal or greater than 5.5. A 24-week confirmed disability progression is defined as a 24-week sustained increase from baseline in the EDSS scores, that is, every EDSS score (scheduled or unscheduled, with or without relapse) within a 24-week duration after the first progression should meet the progression criteria as specified above. EDSS is ordinal clinical scale ranges from 0 (normal neurological examination) to 10 (death due to MS).

PAS included all participants who received at least one dose of ponesimod at any time during the core and/or the extension study (435 participants).

Number of participants with at least one treatment-emergent SAEs were reported. An adverse event (AE) is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study. An SAE is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalisation; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission of any infectious agent via a medicinal product or medically important. Treatment-emergent SAEs were those SAEs that occurred at or after the initial administration of ponesimod up to 15 days (inclusive) after last administration of ponesimod as study drug.

Ponesimod analysis set included all participants who received at least one dose of ponesimod at any time during the core and/or the extension study (435 participants).