Dosing Flexibility Study in Patients With Rheumatoid Arthritis (DoseFlex)

• Percentage of ACR20 (American College of Rheumatology 20% Improvement) Responders at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  ACR20 responders are subjects with at least 20% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  

• Percentage of ACR20 (American College of Rheumatology 20% Improvement) Responders at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]
  ACR20 responders are subjects with at least 20% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  
• Percentage of ACR50 (American College of Rheumatology 50% Improvement) Responders at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]
  ACR50 responders are subjects with at least 50% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  
• Percentage of ACR70 (American College of Rheumatology 70% Improvement) Responders at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]
  ACR70 responders are subjects with at least 70% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  
• Change From Baseline in DAS28 (Disease Activity Score-28 Items) at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]

  DAS28-ESR is calculated using the tender joint count (TJC), swollen joint count (SJC) erythrocyte sedimentation rate (ESR in mm/hour), and the Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in mm) using the following formula: 0.56 x √(TJC) + 0.28 x √(SJC) + 0.70 x lognat (ESR) + 0.014 x Global Assessment of Arthritis where 28 joints are examined and a lower score indicates less disease activity. This analysis was carried out using the Last Observation Carried Forward (LOCF) method.

  < 2.6 Remission,

  > = 2.6 - < =3.2 Low, > 3.2 - < = 5.1 Moderate, > 5.1 High

  
  
• Change From Baseline in SDAI (Simplified Disease Activity Index) at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]

  SDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), C-reactive protein (CRP in mg/dL), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. This analysis was carried out using the Last Observation Carried Forward (LOCF) method.

  <= 3.3 Remission, > 3.3 - <= 11 Low, > 11 - <= 26 Moderate, > 26 High

  
  
• Change From Baseline in CDAI (Clinical Disease Activity Index) at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]

  CDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined. This analysis was carried out using the Last Observation Carried Forward (LOCF) method.

  The range for the CDAI is 0 - 76 with a negative change in CDAI score indicating an improvement in disease activity and a positive change in score indicating a worsening of disease activity.

  
  
• DAS28 (Disease Activity Score-28 Items) Remission (DAS28 <2.6) at Week 16 in All Patients [ Time Frame: Week 16 ] [ Designated as safety issue: No ]

  DAS28-ESR is calculated using the tender joint count (TJC), swollen joint count (SJC) erythrocyte sedimentation rate (ESR in mm/hour), and the Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in mm) using the following formula: 0.56 x √(TJC) + 0.28 x √(SJC) + 0.70 x lognat (ESR) + 0.014 x Global Assessment of Arthritis where 28 joints are examined and a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  < 2.6 (Remission),

  > = 2.6 - < =3.2 Low, > 3.2 - < = 5.1 Moderate, > 5.1 High

  
  
• SDAI (Simplified Disease Activity Index) Remission (SDAI ≤3.3) at Week 16 in All Patients [ Time Frame: Week 16 ] [ Designated as safety issue: No ]

  SDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), C-reactive protein (CRP in mg/dL), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  <= 3.3 (Remission), > 3.3 - <= 11 Low, > 11 - <= 26 Moderate, > 26 High

  
  
• CDAI (Clinical Disease Activity Index) Remission (CDAI ≤2.8) at Week 16 in All Patients [ Time Frame: Week 16 ] [ Designated as safety issue: No ]

  CDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  The range for the CDAI is 0 - 76 with a lower CDAI score indicating approvement in activity and a higher score indicating a decline activity.

  
  
• Ratio From Baseline in CRP (C-reactive Protein) Level at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]
  Ratio is defined as the CRP value at Week 16 divided by the CRP value at Baseline. This analysis was carried out using the Last Observation Carried Forward (LOCF) method.
  
  
• Change From Baseline in HAQ-DI (Health Assessment Questionnaire-Disability Index) Score at Week 16 in All Patients [ Time Frame: Baseline, Week 16 ] [ Designated as safety issue: No ]
  HAQ-DI is derived based on the mean of individual scores in 8 categories of daily living actives (using 20 questions). Each question is scored 0-3 (0 = without any difficulty, 1 = with some difficulty, 2 = with much difficulty, and 3 = unable to do). Thus, the mean also has a range from 0-3. Change from baseline is computed as the value at Week 16 minus the baseline value. A negative value in change from baseline indicates an improvement. This analysis was carried out using the Last Observation Carried Forward (LOCF) method.
  
  
• Percentage of ACR50 (American College of Rheumatology 50% Improvement) Responders at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  ACR50 responders are subjects with at least 50% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  
• Percentage of ACR70 (American College of Rheumatology 70% Improvement) Responders at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  ACR70 responders are subjects with at least 70% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale. Missing values were imputed using Non-Responder Imputation (NRI)
  
  
• Change From Baseline in DAS28 (Disease Activity Score-28 Items) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]

  DAS28-ESR is calculated using the tender joint count (TJC), swollen joint count (SJC) erythrocyte sedimentation rate (ESR in mm/hour), and the Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in mm) using the following formula: 0.56 x √(TJC) + 0.28 x √(SJC) + 0.70 x lognat (ESR) + 0.014 x Global Assessment of Arthritis where 28 joints are examined and a lower score indicates less disease activity. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward.

  < 2.6 Remission,

  > = 2.6 - < =3.2 Low, > 3.2 - < = 5.1 Moderate, > 5.1 High

  
  
• Change From Baseline in SDAI (Simplified Disease Activity Index) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]

  SDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), C-reactive protein (CRP in mg/dL), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.

  <= 3.3 Remission, > 3.3 - <= 11 Low, > 11 - <= 26 Moderate, > 26 High

  
  
• Change From Baseline in CDAI (Clinical Disease Activity Index) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  CDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score. Range for CDAI is 0-76 with a lower CDAI score reflects approvement in activity and a higher score reflects a decline.
  
  
• DAS28 (Disease Activity Score-28 Items) Remission (DAS28 <2.6) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Week 34 ] [ Designated as safety issue: No ]

  DAS28-ESR is calculated using the tender joint count (TJC), swollen joint count (SJC) erythrocyte sedimentation rate (ESR in mm/hour), and the Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in mm) using the following formula: 0.56 x √(TJC) + 0.28 x √(SJC) + 0.70 x lognat (ESR) + 0.014 x Global Assessment of Arthritis where 28 joints are examined and a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  < 2.6 (Remission),

  > = 2.6 - < =3.2 Low, > 3.2 - < = 5.1 Moderate, > 5.1 High

  
  
• SDAI (Simplified Disease Activity Index) Remission (SDAI ≤3.3) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Week 34 ] [ Designated as safety issue: No ]

  SDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), C-reactive protein (CRP in mg/dL), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  <= 3.3 (Remission), > 3.3 - <= 11 Low, > 11 - <= 26 Moderate, > 26 High

  
  
• CDAI (Clinical Disease Activity Index) Remission (CDAI ≤2.8) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Week 34 ] [ Designated as safety issue: No ]

  CDAI is calculated as the sum of tender joint count (TJC), swollen joint count (SJC), Patient's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm), and Investigator's Global Assessment of Disease Activity - Visual Analog Scale (VAS in cm). 28 joints are examined where a lower score indicates less disease activity. Missing values were imputed using Non-Responder Imputation (NRI).

  The range for the CDAI is 0 - 76 with a lower CDAI score indicating approvement in activity and a higher score indicating a decline activity.

  
  
• Ratio From Baseline in CRP (C-reactive Protein) Level at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  Ratio is defined as the CRP value at Week 34 divided by the CRP value at Baseline. This analysis was carried out using the Last Observation Carried Forward (LOCF) method with an ANCOVA model on observed log transformed data with factors treatment and log transformed Baseline CRP level. The number presented is the geometric least squares mean with it's 95% confidence interval.
  
  
• Change From Baseline in HAQ-DI (Health Assessment Questionnaire-Disability Index) Score at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  HAQ-DI is derived based on the mean of individual scores in 8 categories of daily living actives (using 20 questions). Each question is scored 0-3 (0 = without any difficulty, 1 = with some difficulty, 2 = with much difficulty, and 3 = unable to do). Thus, the mean also has a range from 0-3. Change from baseline is computed as the value at Week 34 minus the baseline value. A negative value in change from baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Fatigue Assessment Scale (FAS) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  Change from Baseline in Fatigue Assessment scale (0 to 10, 0 is "No Fatigue" and 10 is "Fatigue as bad as you can imagine") is computed as the value at Week 34 minus the Baseline value. A negative value in change from baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Physical Functioning (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Role Physical (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Bodily Pain (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in General Health (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Vitality (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Social Functioning (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Role Emotional (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in Mental Health (Short Form 36-item Health Survey Domain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  There are 8 SF-36 domain scores: Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, each ranging from 0 to 100, with higher scores indicating better health. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in PCS (Short Form 36-item Health Survey Physical Component Summary) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  PCS norm-based scores are calculated based upon the following 8 domain scores, Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, and range from 1 to 81, where 50 represents the normative value. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in MCS (Short Form 36-item Health Survey Mental Component Summary) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  MCS norm-based scores are calculated based upon the following 8 domain scores, Physical Functioning, Role Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role Emotional and Mental Health, and range from -9 to 82, where 50 represents the normative value. A larger positive value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in PAAP (Patient's Assessment of Arthritis Pain) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  Change from Baseline in Patient's Assessment of Arthritis Pain-VAS (0 to 100 mm visual analog scale, 0 being no pain and 100 being most severe pain) is computed as the value at Week 34 minus the Baseline value. A negative value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Change From Baseline in PtGADA (Patient's Global Assessment of Disease Activity) at Week 34 in Patients Randomized at Week 18 [ Time Frame: Baseline, Week 34 ] [ Designated as safety issue: No ]
  Change from Baseline in Patient's Global Assessment of Disease Activity-VAS (0 to 100 mm visual analog scale, 0 being no symptoms and 100 being severe symptoms) is computed as the value at Week 34 minus the Baseline value. A negative value in change from Baseline indicates an improvement. This analysis was carried out using an ANCOVA model on Last Observation Carried Forward (LOCF) data with factors treatment and Baseline score.
  
  
• Median Time to Loss of ACR20 (American College of Rheumatology 20% Improvement) Response After Week 18 in Patients Randomized at Week 18. [ Time Frame: Week 18 up to Week 34 ] [ Designated as safety issue: No ]
  ACR20 loss are subjects with <20% improvement from Baseline for tender joint count, swollen joint count, and at least 3/5 core set measures: 1) Health Assessment Questionnaire-Disability Index (HAQ-DI), 2) C-reactive Protein, 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale, 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale, 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale at 2 consecutive visits. Subjects losing response for 2 consecutive visits are considered as having the event on the day of the visit where response was first lost.
  
  

Subjects with a stable methotrexate (MTX) dose enter the run-in period in which certolizumab pegol (CZP) will be administered at a dose of 400 mg (2 injections) at Weeks 0, 2, and 4 and at a dose of 200 mg with placebo (1 injection placebo, 1 injection CZP) at Weeks 6, 8, 10, 12, 14 and 16. The dose of MTX should be stable for at least 2 months prior to the Baseline visit and will remain stable throughout the trial, unless there is a need to reduce the dose for reasons of toxicity.

At the Week 18 visit, subjects who were ACR20 (American College of Rheumatology 20% Improvement) responders at Week 16 will be randomized in a double-blinded way to receive either 400 mg CZP given every 4 weeks and placebo given every 4 weeks given as two injections (alternating CZP and placebo every two weeks) plus MTX, 200 mg CZP and placebo administered every 2 weeks (one injection of each) plus MTX, or Placebo administered as two injections every 2 weeks plus MTX. Non-responders will be withdrawn from the study.