Study To Evaluate The Response To Enbrel And The Impact Of Rheumatoid Factor(RF) And Anti-Cyclic Citrullinated Peptide(Anti-CCP) In Rheumatoid Arthritis(RA) Patients

Disease Activity Score 28 (DAS28) in Participants With Positive Rheumatoid Factor (RF) and Anti-Cyclic Citrullinated Peptide (ACCP) at Last Follow-up Visit (Month 12)

DAS28 calculated from the number of swollen joints (SJC) and painful joints (PJC) using the 28 joints count, the erythrocyte sedimentation rate (ESR) (in millimeters per hour \[mm/hour\]) and patient's global assessment (PGA) of disease activity (participant rated arthritis activity assessment with transformed scores ranging 0 to 10; higher scores indicated high disease activity). DAS28 less than equal to (\<=) 3.2 = low disease activity, DAS28 greater than (\>) 3.2 to 5.1 = moderate to high disease activity. DAS28 score in participants with positive RF and ACCP were reported in this outcome measure.

Time frame: Month 12 visit during retrospective data collection period of approximately 7 years

Clinical Disease Activity Index (CDAI) Score in Participants With Positive Rheumatoid Factor (RF) and Anti-Cyclic Citrullinated Peptide (ACCP) at Last Follow-up Visit (Month 12)

The CDAI is the numerical sum of 4 outcome parameters: tender joint count (TJC) and SJC based on a 28-joint assessment, PGA and physician global assessment (PhGA) assessed on 0 to 10 centimeter (cm) visual analog scale (VAS); higher scores = high disease activity. CDAI total score = 0 to 76. CDAI \<= 2.8 indicates disease remission, \> 2.8 to 10 = low disease activity, \> 10 to 22 = moderate disease activity and \> 22 = high disease activity. CDAI score in participants with positive RF and ACCP were reported in this outcome measure.

Time frame: Month 12 visit during retrospective data collection period of approximately 7 years

Disease Activity Score 28 (DAS28) in Participants With Negative Rheumatoid Factor (RF) and Anti-Cyclic Citrullinated Peptide (ACCP) at Last Follow-up Visit (Month 12)

DAS28 calculated from the SJC and PJC using the 28 joints count, the ESR (in mm/hour) and PGA of disease activity (participant rated arthritis activity assessment with transformed scores ranging 0 to 10; higher scores indicated high disease activity). DAS28 \<= 3.2 = low disease activity, DAS28 \> 3.2 to 5.1 = moderate to high disease activity. DAS28 score in participants with negative RF and ACCP were reported in this outcome measure.

Time frame: Month 12 visit during retrospective data collection period of approximately 7 years