The IGA documents the investigator's assessment of the participants' psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling. The participants' psoriasis was assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4).

Randomized analysis set include all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 16 or who did not come for evaluation at week 16 were considered nonresponders) was used to impute missing values.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 90 response represents participants who achieved at least a 90 percent improvement from baseline in the PASI score.

Randomized analysis set include all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 16 or who did not come for evaluation at week 16 were considered nonresponders) was used to impute missing values.

The IGA documents the investigator's assessment of the participants' psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling. The participants' psoriasis was assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4).

Randomized analysis set included all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 24 or Week 48 or who did not come for evaluation at Week 24 or Week 48 were considered nonresponders, respectively, for Week 24 or Week 48 outcome measures) was used to impute missing values.

The IGA documents the investigator's assessment of the participants' psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling. The participants' psoriasis was assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4).

Randomized analysis set included all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 24 or Week 48 or who did not come for evaluation at Week 24 or Week 48 were considered nonresponders, respectively, for Week 24 or Week 48 outcome measures) was used to impute missing values.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 90 response represents participants who achieved at least a 90 percent improvement from baseline in the PASI score.

Randomized analysis set included all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 24 or Week 48 or who did not come for evaluation at Week 24 or Week 48 were considered nonresponders, respectively, for Week 24 or Week 48 outcome measures) was used to impute missing values.

The DLQI is a 10-item questionnaire that measures the impact of skin disease on participant's quality of life. Each question was evaluated on a 4-point scale ranging from 0 (not at all) to 3 (very much); where higher scores indicate more impact on quality of life. The DLQI total score ranges from 0 (not at all) to 30 (very much): 0-1 = no effect at all on the participant's life; 2-6 = small effect on the participant's life; 7-12 = moderate effect on the participant's life; 13-18 = very large effect on the participant's life; 19-30 = extremely large effect on the participant's life. Higher scores indicate more impact on quality of life of participants. This secondary outcome measure was planned to include only the placebo and guselkumab arms.

Randomized analysis set included all participants who were randomized at Week 0 and have a baseline DLQI score.

The IGA documents the investigator's assessment of the participants' psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling. The participants' psoriasis was assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4).

Randomized analysis set include all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 16 or who did not come for evaluation at week 16 were considered nonresponders) was used to impute missing values.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 90 response represents participants who achieved at least a 90 percent improvement from baseline in the PASI score.

Randomized analysis set include all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 16 or who did not come for evaluation at week 16 were considered nonresponders) was used to impute missing values.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 75 response represents participants who achieved at least a 75 percent improvement from baseline in the PASI score.

Randomized analysis set include all participants randomized at Week 0. Nonresponder imputation (participants who met treatment-failure criteria before Week 16 or who did not come for evaluation at week 16 were considered nonresponders) was used to impute missing values.

The ss-IGA instrument is used to evaluate the disease severity of scalp psoriasis. The lesions were assessed in terms of the clinical signs of redness, thickness, and scaliness, which are scored on a 5-point scale ranging from 0 = absence of disease, 1 = very mild disease, 2 = mild disease, 3 = moderate disease, and 4 = severe disease. This secondary outcome measure was planned to include only the placebo and guselkumab arms.

Population analyzed included only randomized participants at Week 0 who had an ss-IGA score greater than or equal to (>=) 2 at baseline.

The PSSD (24-hour version) is a patient-reported outcome (PRO) questionnaire designed and validated to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. It consisted of 11 items covering symptoms (itch, pain, stinging, burning, and skin tightness) and patient-observable signs (skin dryness, cracking, scaling, shedding or flaking, redness, and bleeding) using 0 (absent) to 10 (worst imaginable) numerical rating scales for severity. Items were averaged on the daily symptom score and sign score when at least 3 items (>=50 percentage of 5 items) on these scales are answered. The average value is converted into 0-100 scoring, such that Symptom [or Sign] score = average value*10, where, 0= least severe and 100= most severe and higher score indicates more severe disease. This secondary outcome measure was planned to include only the placebo and guselkumab arms.

PSSD analysis set included all those participants who had baseline PSSD scores as the average score of at least 4 days out of the 7 days prior to the Week 0 visit.

The PSSD (24-hour version) is a patient-reported outcome (PRO) questionnaire designed and validated to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. It consisted of 11 items covering symptoms (itch, pain, stinging, burning, and skin tightness) and patient-observable signs (skin dryness, cracking, scaling, shedding or flaking, redness, and bleeding) using 0 (absent) to 10 (worst imaginable) numerical rating scales for severity. Items were averaged on the daily symptom score and sign score when at least 3 items (>=50 percentage of 5 items) on these scales are answered. The average value is converted into 0-100 scoring, such that Symptom [or Sign] score = average value*10, where, 0= least severe and 100= most severe and higher score indicates more severe disease.

PSSD analysis set included all those participants who were randomized at Week 0 and had baseline PSSD score greater than 0.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 90 response represents participants who achieved at least a 90 percent improvement from baseline in the PASI score. As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.

The PASI is a system used for assessing and grading the severity of psoriatic lesions. In the PASI system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas were assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 to 6, and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that can range from 0 to 72. A higher score indicates more severe disease. A PASI 75 response represents participants who achieved at least a 75 percent improvement from baseline in the PASI score. As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.

The IGA documents the investigator's assessment of the participants' psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling. The participants' psoriasis was assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4). As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.

The DLQI is a 10-item questionnaire that measures the impact of skin disease on participant's quality of life. Each question was evaluated on a 4-point scale ranging from 0 (not at all) to 3 (very much); where higher scores indicate more impact on quality of life. The DLQI total score ranges from 0 (not at all) to 30 (very much): 0-1 = no effect at all on the participant's life; 2-6 = small effect on the participant's life; 7-12 = moderate effect on the participant's life; 13-18 = very large effect on the participant's life; 19-30 = extremely large effect on the participant's life. Higher scores indicate more impact on quality of life of participants. As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab with baseline DLQI score >1. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.

The PSSD (24-hour version) is a PRO questionnaire designed and validated to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. It consisted of 11 items covering symptoms (itch, pain, stinging, burning, and skin tightness) and patient-observable signs (skin dryness, cracking, scaling, shedding or flaking, redness, and bleeding) using 0 (absent) to 10 (worst imaginable) numerical rating scales for severity. Items were averaged on the daily symptom score and sign score when at least 3 items (>=50 percentage of 5 items) on these scales are answered. The average value is converted into 0-100 scoring, such that Symptom score = average value*10, where, 0= least severe and 100= most severe and higher score indicates more severe disease. As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab with baseline PSSD symptom score >0. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.

The PSSD (24-hour version) is a PRO questionnaire designed and validated to measure the severity of psoriasis symptoms and signs for the assessment of treatment benefit. It consisted of 11 items covering symptoms (itch, pain, stinging, burning, and skin tightness) and patient-observable signs (skin dryness, cracking, scaling, shedding or flaking, redness, and bleeding) using 0 (absent) to 10 (worst imaginable) numerical rating scales for severity. Items were averaged on the daily symptom score and sign score when at least 3 items (>=50 percentage of 5 items) on these scales are answered. The average value is converted into 0-100 scoring, such that Sign score = average value*10, where, 0= least severe and 100= most severe and higher score indicates more severe disease. As per planned analysis, participants from the baseline guselkumab group and the placebo crossover group were combined into a single guselkumab group for assessment of this outcome measure.

Population analyzed included participants who were randomized at Week 0 and treated with guselkumab with baseline PSSD sign score >0. The analysis was performed using observed data after applying treatment failure rules. Here, N (Number of participants analyzed) signifies participants who were analyzed for this outcome measure.