ABT-981

HiSCR 75 is defined as at least a 75% reduction from baseline in the total abscess and inflammatory nodule (AN) count, with no increase in abscess count and no increase in draining fistula count relative to baseline.

An AE is defined as any untoward medical occurrence in a patient or clinical investigation participant administered a pharmaceutical product which does not necessarily have a causal relationship with this treatment.

Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR50 response criteria: 1. ≥ 50% improvement in 68-tender joint count; 2. ≥ 50% improvement in 66-swollen joint count; and 3. ≥ 50% improvement in at least 3 of the 5 following parameters: * Physician global assessment of disease activity * Patient global assessment of disease activity * Patient assessment of pain * Health Assessment Questionnaire - Disability Index (HAQ-DI) * High-sensitivity C-reactive protein (hsCRP)

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none \[0\], mild \[1\], moderate \[2\], or severe \[3\]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema). The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An adverse event (AE) is defined as any untoward medical occurrence in a patient or clinical investigation participant administered a pharmaceutical product which does not necessarily have a causal relationship with this treatment. The investigator assesses the relationship of each event to the use of study. A serious adverse event (SAE) is an event that results in death, is life-threatening, requires or prolongs hospitalization, results in a congenital anomaly, persistent or significant disability/incapacity or is an important medical event that, based on medical judgment, may jeopardize the participant and may require medical or surgical intervention to prevent any of the outcomes listed above. Treatment-emergent adverse events/treatment-emergent serious adverse events (TEAEs/TESAEs) are defined as any event that began or worsened in severity on or after the first dose of study drug.

Endoscopic Improvement is defined as Mayo Endoscopic Subscore (ESS) of 0 or 1. Endoscopies were assessed by a blinded central reader and scored according to the following scale: 0 = Normal appearance of mucosa; 1 = Mild disease (erythema, decreased vascular pattern); 2 = Moderate disease (marked erythema, lack of vascular pattern, any friability, erosions); 3 = Severe disease (spontaneous bleeding, ulceration).

HiSCR is defined as at least a 50% reduction from Baseline in the total abscess and inflammatory nodule (AN) count, with no increase in abscess count and no increase in draining fistula-count relative to Baseline.

The AUSCAN NR3.1 is a self-report measure composed of a battery of 15 questions assessing the three dimensions of pain (5 questions), joint stiffness (1 question) and physical function (9 questions) using an 11-box Numerical Rating Scale (NRS-11) from 0 (low) to 10 (high). The pain subdomain score ranges from 0 to 50; lower scores indicate better status. A decrease in the pain subdomain score represents improvement in status. Last Observation Carried Forward (LOCF): Missing responses were imputed by calculation based on the last nonmissing postbaseline component values.

The WOMAC was developed to assess pain, stiffness, and physical function in subjects with hip and/or knee osteoarthritis. The WOMAC consists of 24 items divided into 3 subscales: Pain (5 items); Stiffness (2 items); and Physical Function (17 items). Each item is rated on an 11-point (0 to 10) numerical rating scale (NRS). The pain sub-score has a range of 0 (no pain) to 50 (maximum pain). A negative change from baseline indicates improvement.

Change in synovitis of the index knee was evaluated using quantitative magnetic resonance imaging (MRI) measurements. MRI quantitative synovitis of the index knee was defined by mean synovial membrane thickness.

Semi-quantitative synovitis/effusion volume WORMS scores were scored as normal (0), \< 33% of maximum estimated distention (1), 33% - 66% of maximum estimated distention (2), or \> 66% of maximum estimated distention (3).

Collect all adverse events at each visit

Blood pressure, heart rate and body temperature

Hematology, Chemistry, and Urinalysis

ECGs done in triplicate

Cmax

Time to Cmax

AUC