An AE is any untoward medical occurrence in a subject or trial subject that is administered a drug or biologic (medicinal product) or that is using a medical device. The event does not necessarily have a causal relationship with that treatment or usage.

First dose of CZP was at Baseline of one of the feeder studies C87011 [NCT00548834] or C87014 [NCT00544154] for subjects randomized to CZP, or at First Visit (Week 0) of this study for subjects randomized to Placebo.

Safety Set (SS).

An AE is any untoward medical occurrence in a subject or trial subject that is administered a drug or biologic (medicinal product) or that is using a medical device. The event does not necessarily have a causal relationship with that treatment or usage.

The results of this Primary Outcome Measure are summarized from the Adverse Event pages of the Case Report Forms.

Safety Set (SS).

The assessments are based on a 20% or greater improvement from Baseline to Week 52 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 370 subjects are included in this analysis, because they had available data at Baseline and Week 52.

The assessments are based on a 20% or greater improvement from Baseline to Week 100 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 275 subjects are included in this analysis, because they had available data at Baseline and Week 100.

The assessments are based on a 20% or greater improvement from Baseline to Week 160 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 247 subjects are included in this analysis, because they had available data at Baseline and Week 160.

The assessments are based on a 20% or greater improvement from Baseline to Week 208 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 223 subjects are included in this analysis, because they had available data at Baseline and Week 208.

The assessments are based on a 20% or greater improvement from Baseline to Week 256 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 211 subjects are included in this analysis, because they had available data at Baseline and Week 256.

The assessments are based on a 20% or greater improvement from Baseline to Week 316 in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Baseline is Baseline of the respective feeder study.

Of the 402 subjects in the Safety Set (SS), 140 subjects are included in this analysis, because they had available data at Baseline and Week 316.

The assessments are based on a 20% or greater improvement from Baseline to the Completion Visit or early Withdrawal Visit in the number of tender joints, a 20% or more improvement in the number of swollen joints, and a 20% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Safety Set (SS).

The assessments are based on a 50% or greater improvement from Baseline to the Completion Visit or early Withdrawal Visit in the number of tender joints, a 50% or more improvement in the number of swollen joints, and a 50% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Safety Set (SS).

The assessments are based on a 70% or greater improvement from Baseline to the Completion Visit or early Withdrawal Visit in the number of tender joints, a 70% or more improvement in the number of swollen joints, and a 70% or greater improvement in 3 of the 5 remaining core set measures: Patient's Global Assessment of Disease Activity (PtGADA), Physician's Global Assessment of Disease Activity (PhGADA), Patient's Assessment of Arthritis Pain (PtAAP), physical function as assessed by the Health Assessment Questionnaire - Disability Index (HAQ-DI) and C-Reactive Protein (CRP).

Safety Set (SS).

The HAQ-DI assesses the degree of difficulty experienced in eight domains (Dressing and Grooming, Arising, Eating, Walking, Hygiene, Reach, Gripping, Other Activities) of daily living activities using 20 questions. The HAQ-DI is calculated by summing the domain scores and dividing them by the number of domains. It ranges from 0 (no difficulty) to 3 (unable to do). Negative values indicate an improvement from Baseline to the Post-Baseline Visit with larger negative values showing a better improvement.

Of the 402 subjects in the Safety Set (SS), 400 subjects are included in this analysis, because they had available data at Baseline and Completion or early Withdrawal Visit.

Safety Set (SS).

This Secondary Outcome Measure shows additional arthritis medications received by at least 20% of subjects during the 8-year study.

Safety Set (SS).