The ACR70 response rate was based on 70% improvement relative to Baseline in the following measures:

• TJC based on 78 joints

• SJC based on 76 joints

• 3 of the 5 remaining core set measures:

  • Disease activity as assessed by PGADA
  • Disease activity as assessed by PhGADA
  • Pain as assessed by PtAAP
  • Physical function as assessed by HAQ-DI
  • Acute phase response as assessed by hs CRP

Note: Nonresponder imputation was used to account for missing data in the primary analysis, the study participants with a missing ACR score at Week 12 or who discontinued IMP prior to the Week 12 Visit were considered nonresponders for the primary analysis.

The PASI90 response assessments are based on at least 90% improvement in the PASI score from Baseline. This is a scoring system that averages the redness, thickness, and scaliness of the psoriatic lesions (on a 0-4 scale), and weights the resulting score by the area of skin involved. Body divided into 4 areas: head, arms, trunk to groin, and legs to top of buttocks. Assignment of an average score for the redness, thickness, and scaling for each of the 4 body areas with a score of 0 (clear) to 4 (very marked).

Determining the percentage of skin covered with PSO for each of the body areas and converting to a 0 to 6 scale. Final PASI= average redness, thickness, and scaliness of the psoriatic skin lesions, multiplied by the involved psoriasis area score of the respective section, and weighted by the percentage of the person's affected skin for the respective section. The minimum possible PASI score is 0= no disease, the maximum score is 72= maximal disease.

The PASI75 response assessments are based on at least 75% improvement in the PASI score from Baseline. This is a scoring system that averages the redness, thickness, and scaliness of the psoriatic lesions (on a 0-4 scale), and weights the resulting score by the area of skin involved. Body divided into 4 areas: head, arms, trunk to groin, and legs to top of buttocks. Assignment of an average score for the redness, thickness, and scaling for each of the 4 body areas with a score of 0 (clear) to 4 (very marked).

Determining the percentage of skin covered with PSO for each of the body areas and converting to a 0 to 6 scale. Final PASI= average redness, thickness, and scaliness of the psoriatic skin lesions, multiplied by the involved psoriasis area score of the respective section, and weighted by the percentage of the person's affected skin for the respective section. The minimum possible PASI score is 0= no disease, the maximum score is 72= maximal disease.

An adverse event (AE) was any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of investigational medicinal product (IMP), whether or not considered related to the IMP. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of IMP.

A Serious Adverse Event (SAE) is any untoward medical occurrence that at any dose:

• Results in death
• Is life-threatening
• Requires in patient hospitalization or prolongation of existing hospitalization
• Is a congenital anomaly or birth defect
• Is an infection that requires treatment parenteral antibiotics
• Other important medical events which based on medical or scientific judgement may jeopardize the patients, or may require medical or surgical intervention to prevent any of the above.

An adverse event (AE) was any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of investigational medicinal product (IMP), whether or not considered related to the IMP. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of IMP.

Diastolic and systolic blood pressure were measured in millimeters of mercury (mmHg).

Pulse rate was measured in beats per minute (beats/min).

Body weight was measured in kilograms.

Electrocardiogram (ECG) intervals (QTcB= QT interval corrected for heart rate (Bazett's formula); QTcF= QT interval corrected for heart rate (Fridericia's formula)) were measured in milliseconds.

Basophils, eosinophils, leukocytes, lymphocytes, monocytes, neutrophils were measured in number of white blood cells per liter (10^9/L).

Erythrocytes mean corpuscular hemoglobin (HGB) concentration and hemoglobin were measured in grams per liter (g/L).

Erythrocytes mean corpuscular hemoglobin (HGB) was measured in picograms (pg).

Erythrocytes mean corpuscular volume was measured in femtolitres (fL).

Erythrocytes was measured in number of red blood cells per liter (10^12/L).

Hematocrit was measured in volume percentage (%) of red blood cells in blood.

Platelets was measured in number of platelets per liter (10^9/L).

Alanine aminotransferase, alkaline phosphatase, aspartate aminotransferase, gamma glutamyl transferase, lactate dehydrogenase were measured in units per liter (U/L).

Albumin was measured in grams per liter (g/L).

Bilirubin, creatinine, urate were measured in micromols per liter (μmol/L).

Calcium, chloride, cholesterol, glucose, magnesium, potassium, sodium were measured in millimoles per liter (mmol/L).

Urea nitrogen was measured in millimoles per liter (mmol/L).

Erythrocytes, leukocytes, renal epithelial casts, squamous epithelial cells, transitional epithelial cells were measured in cells per high power field (cells/HPF).

Hyaline casts was measured in cells per low power field (cells/LPF).

Urine pH was measured on a pH scale.

Participants received Bimekizumab (BKZ) 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period.

Participants received Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period.

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Placebo were re-randomized to receive Bimekizumab (BKZ) 160 mg every 4 weeks (Q4W) for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Placebo were re-randomized to receive Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Bimekizumab (BKZ) 16 mg every 4 weeks (Q4W) were re-randomized to receive BKZ 160 mg Q4W for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Bimekizumab (BKZ) 16 mg every 4 weeks (Q4W) were re-randomized to receive BKZ 320 mg Q4W for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) were re-randomized to receive BKZ 160 mg Q4W for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Bimekizumab (BKZ) 160 mg every 4 weeks (Q4W) were re-randomized to receive BKZ 160 mg Q4W for 36 weeks in the Dose-Blind Period.

After the 12 Weeks Double-Blind Period participants randomized to Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) were re-randomized to receive BKZ 320 mg Q4W for 36 weeks in the Dose-Blind Period.

For differences in relation to placebo: Odds Ratio, confidence interval, and p-value were derived from a logistic regression model including fixed effects for treatment, geographic region and prior Tumor Factor Necrosis (TNF) inhibitor exposure.

The p-values were displayed as nominal p-values.

The pairwise testing of each bimekizumab dose versus placebo accounted for multiplicity by using a fixed sequence testing procedure with each bimekizumab dose being tested sequentially from the highest dose to the lowest dose. If the sequential testing failed to reach significance at a significance level of alpha=0.05, then the pairwise testing continued and the comparison was seen as non-significant.

For differences in relation to placebo: Odds Ratio, confidence interval, and p-value were derived from a logistic regression model including fixed effects for treatment, geographic region and prior Tumor Factor Necrosis (TNF) inhibitor exposure.

The p-values were displayed as nominal p-values.

The pairwise testing of each bimekizumab dose versus placebo accounted for multiplicity by using a fixed sequence testing procedure with each bimekizumab dose being tested sequentially from the highest dose to the lowest dose. If the sequential testing failed to reach significance at a significance level of alpha=0.05, then the pairwise testing continued and the comparison was seen as non-significant.

For differences in relation to placebo: Odds Ratio, confidence interval, and p-value were derived from a logistic regression model including fixed effects for treatment, geographic region and prior Tumor Factor Necrosis (TNF) inhibitor exposure.

The p-values were displayed as nominal p-values.

The pairwise testing of each bimekizumab dose versus placebo accounted for multiplicity by using a fixed sequence testing procedure with each bimekizumab dose being tested sequentially from the highest dose to the lowest dose. If the sequential testing failed to reach significance at a significance level of alpha=0.05, then the pairwise testing continued and the comparison was seen as non-significant.

For differences in relation to placebo: Odds Ratio, confidence interval, and p-value were derived from a logistic regression model including fixed effects for treatment, geographic region and prior Tumor Factor Necrosis (TNF) inhibitor exposure.

The p-values were displayed as nominal p-values.

The pairwise testing of each bimekizumab dose versus placebo accounted for multiplicity by using a fixed sequence testing procedure with each bimekizumab dose being tested sequentially from the highest dose to the lowest dose. If the sequential testing failed to reach significance at a significance level of alpha=0.05, then the pairwise testing continued and the comparison was seen as non-significant.

Participants received Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg at Baseline followed by 160 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period, forming the Full Analysis Set (FAS).

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the Full Analysis Set (FAS).

This arm consisted of all participants who received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) at any time in the study (up to Week 68). Participants formed the SS.

This arm consisted of all participants who received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) at any time in the study (up to Week 68). Participants formed the SS.

This arm consisted of all participants who received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) at any time in the study (up to Week 68). Participants formed the SS.

Participants received Bimekizumab (BKZ) 320 mg every 4 weeks (Q4W) during the 12 Weeks Double-Blind Period followed by the same dose during the 36 Weeks Dose-Blind Period, forming the SS.