The DAS28 is a validated index of rheumatoid arthritis disease activity. Twenty-eight tender joint counts, 28 swollen joint counts, C-reactive protein, and general health are included in the DAS28 score. Scores on the DAS28 range from 0 to 10. A DAS28 score greater than 5.1 indicates high disease activity, a DAS28 score less than 3.2 indicates low disease activity, and a DAS28 score less than 2.6 indicates clinical remission.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Tender joint count represents the number of joints displaying tenderness. Although the DAS28 includes assessments of 28 joints, additional joints are typically evaluated in examinations of participants with Psoriatic Arthritis (PsA) as the joints typically affected in these participants differ from those commonly involved in Rheumatoid Arthritis (RA). Specifically, PsA often involves distal interphalangeal joints (DIP), whereas RA does not.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Swollen joint count represents the number of joints displaying swelling. Although the DAS28 includes assessments of 28 joints, additional joints are typically evaluated in examinations of participants with Psoriatic Arthritis (PsA) as the joints typically affected in these participants differ from those commonly involved in Rheumatoid Arthritis (RA). Specifically, PsA often involves distal interphalangeal joints (DIP), whereas RA does not.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Body surface area was used to evaluate the extent of psoriatic skin involvement. At baseline, investigators classified participants as having BSA less than 3%, 3 to 10%, 11 to 20%, or greater than 20%. At all post-baseline time points, clinicians were asked to estimate BSA on a scale of 0% to 100% rather than as categories. BSA was visually determined by the investigator using the 'rule of nines' and estimating that the palm of the patient's hand was equal to 1% BSA.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

The Target Lesion Score (TLS) was based on the severity of erythema, scaling, and infiltration of a prospectively-defined psoriasis target lesion of at least 2 cm in width that was considered to be representative of all other affected areas. Each of the three characteristics was evaluated by the clinician on a scale of 0 (absent) to 5 (maximal expression), and these scores were totaled to provide a TLS ranging from 0 (lowest severity) to 15 (highest severity).

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Adverse Events (AEs) were reported that clinicians considered to be related to the study drug. An AE was considered to be a serious adverse event (SAE) if any of the following criteria were met: Death of participant, life-threatening event, hospitalization, prolongation of hospitalization, congenital anomaly, persistent or significant disability or incapacity, important medical event requiring medical or surgical intervention to prevent serious outcome, or spontaneous or elective abortion.

Safety Set - All enrolled participants

Enthesitis is a distinguishing characteristic of PsA. Enthesitis involves inflammation at the site where tendons and other connective tissues enter the bone. Investigators reported the presence or absence of enthesitis on the basis of their clinical evaluation; no specific scale or score was used. If present, the severity of each condition was graded by the investigator on a scale of mild, moderate, and severe based on their clinical impression.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Dactylitis is a distinguishing characteristic of PsA. Dactylitis, sometimes referred to "sausage digit," involves swelling of the entire finger. Investigators reported the presence or absence of dactylitis on the basis of their clinical evaluation; no specific scale or score was used. If present, the severity of each condition was graded by the investigator on a scale of mild, moderate, and severe based on their clinical impression.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Nail psoriasis is a distinguishing characteristic of PsA. Nail psoriasis is characterized by changes in the nail and nail matrix, including pitting, onycholysis (painless separation of the nail from the nail bed), and reddish spots. Investigators reported the presence or absence of nail psoriasis on the basis of their clinical evaluation; no specific scale or score was used. If present, the severity of this condition was graded by the investigator on a scale of mild, moderate, and severe based on their clinical impression.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

The Erythrocyte Sedimentation Rate (ESR) is a practicable and sensitive but not specific parameter for measuring disease progression. By means of the ESR it can be generally distinguished between an active and nonactive rheumatic disease. The normal reference range is, as a rule, 0 to 10 mm/h for men and 0 to 15 mm/h for women. The higher the ESR value out of the normal range, the higher is the disease activity.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

The C-Reactive Protein (CRP) is an acute phase reactant plasma protein, normally produced by the liver, which is commonly used as an indirect measure of the extent and activity of an inflammation. The CRP normal reference range in the blood is, as a rule, from 0 to 1.0 mg/dL.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Measured on a visual analog scale (VAS) of 0 to 10 cm; lower scores indicate better participant's status.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Measured on a visual analog scale (VAS) of 0 to 10 cm; lower scores indicate better participant's status.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

Measured on a visual analog scale (VAS) of 0 to 10 cm; lower scores indicate better participant's status.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.

A self-administered participant questionnaire used to assess patient function on a scale of 0 (total loss of functional capacity) to 100 (maximal functional capacity) units; the FFbH score indicates the remaining percentage of participant function.

Effectiveness analyses were performed on the full analysis set (FAS). Participants with inadequate data or who met other exclusion criteria were not included in the FAS.