The percentage of subjects in clinical remission at Week 6 (clinical remission is defined as a total Crohn's Disease Activity Index (CDAI) score of 150 points or less). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects achieving a clinical response at Week 6 (clinical response is defined as at least a 100-point decrease from the Week 0 Crohn's Disease Activity Index (CDAI) score). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in Inflammatory Bowel Disease Questionnaire (IBDQ) remission at Week 6 (IBDQ remission is defined as a total IBDQ score of 170 points or more). The IBDQ Global Score is the sum of 32 responses, each ranging from 0 to 7, thus the Global Score ranges from 0 to 224; a higher score indicating a better quality of life.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The change in total Crohn's Disease Activity Index (CDAI) score from Week 0 to Week 6. CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 192 and 183 subjects respectively are included in this summary and have assessments at both Weeks 0 and 6. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The change in Harvey Bradshaw Index (HBI) score from Week 0 to Week 6. HBI score consists of clinical parameters of general well-being (0 to 4), abdominal pain (0 to 3), number of liquid stools per day, abdominal mass (0 to 3), and complications (score 1 per item). The first three items are scored for the previous day. Lower scores indicated better well being.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 196 and 187 subjects respectively are included in this summary and have assessments at both Weeks 0 and 6. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in clinical remission at Week 2 (clinical remission is defined as a total Crohn's Disease Activity Index (CDAI) score of 150 points or less). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in clinical remission at Week 4 (clinical remission is defined as a total Crohn's Disease Activity Index (CDAI) score of 150 points or less). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects achieving a clinical response at Week 2 (clinical response is defined as at least a 100-point decrease from the Week 0 Crohn's Disease Activity Index (CDAI) score). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects achieving a clinical response at Week 4 (clinical response is defined as at least a 100-point decrease from the Week 0 Crohn's Disease Activity Index (CDAI) score). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The change in total Crohn's Disease Activity Index (CDAI) score from Week 0 to Week 2. CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 204 and 198 subjects respectively are included in this summary and have assessments at both Weeks 0 and 2. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The change in total Crohn's Disease Activity Index (CDAI) score from Week 0 to Week 4. CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 198 and 184 subjects respectively are included in this summary and have assessments at both Weeks 0 and 4. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in Inflammatory Bowel Disease Questionnaire (IBDQ) remission at Week 2 (IBDQ remission is defined as a total IBDQ score of 170 points or more). The IBDQ Global Score is the sum of 32 responses, each ranging from 0 to 7, thus the Global Score ranges from 0 to 224; a higher score indicating a better quality of life.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in Inflammatory Bowel Disease Questionnaire (IBDQ) remission at Week 4 (IBDQ remission is defined as a total IBDQ score of 170 points or more). The IBDQ Global Score is the sum of 32 responses, each ranging from 0 to 7, thus the Global Score ranges from 0 to 224; a higher score indicating a better quality of life.

Of the 223 (Certolizumab Pegol 400 mg) and 216 (Placebo) subjects randomized, 215 and 209 subjects are included in the Intent-to-treat (ITT) population, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in the subgroup with less than 10 mg/L of C-reactive Protein (CRP) at Entry who are in clinical remission at Week 6 (clinical remission is defined as a total Crohn's Disease Activity Index (CDAI) score of 150 points or less). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 122 and 113 subjects are in the less than 10 mg/L C-reactive Protein (CRP) subgroup at Entry, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in the subgroup with 10 mg/L or greater C-reactive Protein (CRP) at Entry in clinical remission at Week 6 (clinical remission is defined as a total Crohn's Disease Activity Index (CDAI) score of 150 points or less). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 93 and 96 subjects are in the 10 mg/L or greater C-reactive Protein (CRP) subgroup at Entry, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in the subgroup with less than 10 mg/L C-reactive Protein (CRP) at Entry achieving a clinical response at Week 6 (clinical response is defined as at least a 100-point decrease from the Week 0 Crohn's Disease Activity Index (CDAI) score). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 122 and 113 subjects are in the less than 10 mg/L C-reactive Protein (CRP) subgroup at Entry, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose.

The percentage of subjects in the subgroup with 10 mg/L or greater C-reactive Protein (CRP) at Entry achieving a clinical response at Week 6 (clinical response is defined as at least a 100-point decrease from the Week 0 Crohn's Disease Activity Index (CDAI) score). CDAI is used to quantify the symptoms of subjects with Crohn's disease. A score of 150 points or below indicates clinical remission and a score above 450 points indicates extremely severe disease.

Of the 215 (Certolizumab Pegol 400 mg) and 209 (Placebo) subjects in the Intent-to-treat (ITT) population, 93 and 96 subjects are in the 10 mg/L or greater C-reactive Protein (CRP) subgroup at Entry, respectively. ITT population: subjects who received at least one dose of study drug, and who had at least one efficacy measurement after first dose