Pre-specified cardiovascular events were adjudicated by committees of external experts who were blinded to treatment assignment. Potential events of interest (pEoI) were identified by the investigator, sponsor, review of alerts from central electrocardiogram assessments, and by search of adverse events (AE)/serious adverse event (SAE) listings for events coded to death (coronary and non-coronary), myocardial infarction (non-fatal), all coronary revascularization, unstable angina, stroke (fatal and non-fatal), transient ischemic attack, congestive heart failure, peripheral arterial vascular disease, dyspnoea, and chest pain. The independent reviewers (IRs) determined if the pEoI met the criteria for EoI classification according to the definitions summarized from the Clinical Data Interchange Standards Consortium 'Standardized Definitions for End Point Events in Cardiovascular Trials' published October 2010.

Participants in the SAS who had pEoI and were adjudicated by IRs

Pre-specified malignancy events were adjudicated by committees of external experts who were blinded to treatment assignment. pEoI were identified by the investigator, sponsor, potential primary event notifications (i.e. malignancies excluding non-melanoma skin cancers) for a specific protocol, events submitted for histopathology review for potential malignancies which met the criteria for potential malignancies, and by search of AE/SAE listings for events coded to Malignant tumors Standard Medical Dictionary for Regulatory Activities (MedDRA) Queries (SMQ) (20000194). IRs determined if the pEoI met the criteria for EoI classification according to the International Classification of Diseases for Oncology, a ten-digit multi-axial classification of the site (4 characters), morphology (4 digits), behavior (1 digit), and grading (1 digit) of neoplasms.

Participants in the SAS who had pEoI and were adjudicated by IRs

CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. Clinical remission was defined as a CDAI score of less than (<) 150. Sustained clinical remission was defined as being in clinical remission (CDAI score <150) at both Week 24 and Week 48. 95 percent (%) Clopper-Pearson exact confidence interval reported for the proportions. n = number of participants with non-missing data.

Full analysis set (FAS) - consisted of all participants enrolled in this OL extension study.

CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. Clinical remission was defined as a CDAI score of <150. Sustained clinical remission was defined as being in clinical remission (CDAI score <150) at both Week 24 and Week 48. 95% Clopper-Pearson exact confidence interval reported for the proportions. n = number of participants with non-missing data.

Participants in the FAS who met clinical remission criteria at baseline of this study

CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. Clinical remission was defined as a CDAI score of <150. Sustained clinical remission was defined as being in clinical remission (CDAI score <150) at both Week 24 and Week 48. Clinical response was defined as a CDAI score reduction of at least 100 points from the A3921083 study baseline value. 95% Clopper-Pearson exact confidence interval reported for the proportions. n = number of participants with non-missing data.

Participants in the FAS who met clinical response or clinical remission criteria at baseline of this study

Relapse was defined as an increase in CDAI of more than (>) 100 points from the baseline and an absolute CDAI score of >220 points. CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. Data presented are rates estimated from Kaplan-Meier curves.

n = number of participants remaining at risk.

Participants in the FAS who met clinical remission criteria at baseline of this study

CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. n = number of participants remaining at risk.

FAS

CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity. n = number of participants with non-missing data.

FAS

Steroid-free clinical remission at Week 48 was a CDAI <150 points in participants who were steroid-free at Week 48. CDAI is a composite index consisting of weighted scoring of 8 disease variables: number of liquid or very soft stools, intensity of abdominal pain, general well-being, occurrence of extraintestinal symptoms, need for antidiarrheal drugs, presence of abdominal masses, hematocrit, and body weight. CDAI scores range from 0 to approximately 600 points, higher score indicates higher disease activity.

Participants in FAS who were on steroids at baseline of this study

Use of corticosteroids (yes or no) was recorded at baseline and throughout the study. Percentage of participants taking corticosteriod at each visit was reported.

SAS

There was a single study treatment dose adjustment allowed, at the discretion of the Investigator, from 5 mg BID to 10 mg BID or from 10 mg BID to 5 mg BID, after the initial 8 weeks of fixed open label treatment and for the remaining treatment period of 40 weeks. Percentage of participants whose study treatment were switched from 5 mg BID to 10 mg BID or 10 mg BID to 5 mg BID after initial assignment was reported.

FAS

Fecal calprotectin is an inflammatory marker for the gastrointestinal tract and considered as a measurement of neutrophil migration to the gastrointestinal tract. Higher values indicate more serious inflammation. n = number of participants with non-missing data.

FAS

The test for CRP is a laboratory measurement for evaluation of an acute phase reactant of inflammation through the use of an ultrasensitive assay. A decrease in the level of CRP indicates reduction in inflammation and therefore improvement. n = number of participants with non-missing data.

FAS

The IBDQ is a psychometrically validated patient reported outcome (PRO) instrument for measuring disease-specific quality of life (QoL) in participants with inflammatory bowel disease (IBD). IBDQ consists of 32 items, each item score ranged from 1 (worst possible response) to 7 (best possible response). The 32 items are grouped into 4 domains: bowel function, emotional status, systemic symptoms and social function. The 4 domains are scored as follows: bowel symptoms 10 to 70; systemic symptoms 5 to 35; emotional function 12 to 84; social function 5 to 35. For each domain, a higher score indicates better QoL. Total score is the sum of each item score, and ranged from 32 to 224 with a higher score indicating a better QoL. Positive change in total score indicated improvement in QoL. n = number of participants with non-missing data.

FAS

The IBDQ is a psychometrically validated PRO instrument for measuring disease-specific QoL in participants with IBD. IBDQ consists of 32 items, each item score ranged from 1 (worst possible response) to 7 (best possible response). The 32 items are grouped into 4 domains: bowel function, emotional status, systemic symptoms and social function. The 4 domains are scored as follows: bowel symptoms 10 to 70; systemic symptoms 5 to 35; emotional function 12 to 84; social function 5 to 35. For each domain, a higher score indicates better QoL. Total score is the sum of each item score, and ranged from 32 to 224 with a higher score indicating a better QoL. Positive change in total score indicated improvement in QoL.

Participants in the FAS who had non-missing data at Week 48/ET visit

The IBDQ is a psychometrically validated PRO instrument for measuring disease-specific QoL in participants with IBD. IBDQ consists of 32 items, each item score ranged from 1 (worst possible response) to 7 (best possible response). Total score is the sum of each item score, and ranged from 32 to 224 with a higher score indicating a better QoL. A score ≥170 corresponds to clinical remission. 95% Clopper-Pearson exact confidence interval reported for the proportions.

Participants in the FAS who had non-missing data at Week 48/ET visit

The IBD PRTI modified questionnaire comprises 3 individual questions administered to the participant: participant satisfaction with study treatment; participant preference for study drug over prior treatment (this question on participant preference for study drug is prefaced by a simple question of previous treatment/s for IBD received in order to place the preference question into context) and participant willingness to reuse the study treatment again. Each of these questions (except the question on previous treatment, which is informational only) is scored on a 5 point Likert scale. PSA = Patient Satisfaction Assessment; PPTA = Patient Previous Treatment Assessment; PPA = Patient Preference Assessment; PWA = Patient Willingness Assessment.

Participants in the FAS who had a response to PRTI assessment at Week 48/ET visit

The component and domain scores were scored using the United States (US) 1998 general population norms. The resulting norm-based T scores for both the SF36 version 2 and SF36 health domain scales and component summary measures have means of 50 and standard deviations of 10. Higher scores indicate better health-related QoL. n = number of participants with non-missing data.

FAS

The component and domain scores were scored using the US 1998 general population norms. The resulting norm-based T scores for both the SF36 version 2 and SF36 health domain scales and component summary measures have means of 50 and standard deviations of 10. Higher scores indicate better health-related QoL. n = number of participants with non-missing data.

FAS

EQ5D is a participant rated questionnaire to assess health-related QoL in terms of a single utility score. Health State Profile component assesses level of current health for 5 domains: mobility, selfcare, usual activities, pain and discomfort, and anxiety and depression; 1 indicates better health state (no problems); 3 indicates worst health state ("confined to bed"). Scoring formula developed by EuroQol Group assigns a utility value for each domain in the profile. Score is transformed and results in a total score range from 0.594 to 1.000; a higher score indicates a better health state. n = number of participants with non-missing data.

FAS

EQ5D is a participant rated questionnaire to assess health-related QoL in terms of a single utility score. Health State Profile component assesses level of current health for 5 domains: mobility, selfcare, usual activities, pain and discomfort, and anxiety and depression; 1 indicates better health state (no problems); 3 indicates worst health state ("confined to bed"). Scoring formula developed by EuroQol Group assigns a utility value for each domain in the profile. Score is transformed and results in a total score range from 0.594 to 1.000; a higher score indicates a better health state.

Participants in the FAS who had non-missing data at Week 48/ET visit

EQ5D is a participant rated questionnaire to assess health-related QoL in terms of a single index value. The VAS component rates current health state on a scale from 0 millimeters (mm) (worst imaginable health state) to 100 mm (best imaginable health state); higher scores indicate a better health state. n = number of participants with non-missing data.

FAS

EQ5D is a participant rated questionnaire to assess health-related QoL in terms of a single index value. The VAS component rates current health state on a scale from 0 mm (worst imaginable health state) to 100 mm (best imaginable health state); higher scores indicate a better health state.

Participants in the FAS who had non-missing data at Week 48/ET visit

The number of participants hospitalized due to Crohn's disease were recorded at every study visit.

SAS

Pre-specified liver injury events were adjudicated by blinded committees of external experts. pEoI were identified by investigator, sponsor & search of clinical, safety & laboratory databases (potential Hy's law event, ALT/AST ≥5 x ULN, events meeting hepatic discontinuation criteria, SAEs coded to MedDRA hepatobiliary system organ class (SOC), AEs/SAEs coded to MedDRA liver infections or infectious biliary disorders SMQ, AEs coded to MedDRA drug-induced liver injury (DILI) preferred term or any death with ALT or AST ≥3xULN, bilirubin ≥2xULN or jaundice). IRs determined if the pEoI met the criteria for EoI classification by assessing DILI (definite, highly likely, probable, possible, unlikely, unrelated or undetermined), pattern (hepatocellular, mixed, cholestatic or undetermined), likely, competing or alternative cause(s), severity (mild, moderate, severe, fatal/transplantation or undetermined), Hy's law case, recovery & liver failure (all yes, no or undetermined).

Participants in the SAS who had pEoI and were adjudicated by IRs

Pre-specified opportunistic infection events were adjudicated by blinded committees of external experts. pEoI were identified by investigator, sponsor & search of SAE listings for serious infections coded to MedDRA infections & infestations SOC &/or events meeting pre-specified criteria for IR pre-screening to determine if adjudication is required. IRs determined if the pEoI met the criteria for EoI classification according to definitions for opportunistic infections (invasive fungal infections per the European Organization for Research & Treatment of Cancer/Invasive Fungal Infections Cooperative Group & the National Institute of Allergy & Infectious Diseases Mycoses Study Group [EORTC/MSG] Consensus Group definitions, endemic fungal infections per the EORTC/MSG Consensus Group definitions, other fungal infections, viral, bacterial & parasitic infections & vaccine dissemination) & special interest infections (actinomycosis, Legionella & mononucleosis-like toxoplasmosis).

Participants in the SAS who had pEoI and were adjudicated by IRs

Pre-specified GI perforation events were adjudicated by committees of external experts who were blinded to treatment assignment. The pEoI were identified via search of AE/SAE listings using the MedDRA GI Perforation SMQ. The IRs determined if the pEoI met the criteria for EoI classification based on whether a GI perforation occurred and if yes, the location within the GI tract, possible contributing medical conditions and/or concomitant medications.

Participants in the SAS who had pEoI and were adjudicated by IRs

Pre-specified ILD events were adjudicated by committees of external experts who were blinded to treatment assignment. pEoI were identified by searches of the clinical, safety & laboratory databases (AEs coded to the MedDRA ILD SMQ and events nominated by the study clinician or clinical lead). The IRs determined if the pEoI met the criteria for EoI classification by assessment of the ILD event (probably ILD, possible ILD, alternative diagnosis likely, other or insufficient information to classify).

Participants in the SAS who had pEoI and were adjudicated by IRs

The length of hospitalizations due to Crohn's disease were recorded at every study visit.

SAS