A Study to Evaluate the Efficacy and Safety of JNJ-77242113 (Icotrokinra) in Biologic-naïve Participants With Active Psoriatic Arthritis

Primary Outcome Measures

1. Proportion of Participants who Achieve an American College of Rheumatology (ACR) ACR 20 Response at Week 16
   The ACR 20 responders are participants with an improvement of greater than or equal to (\>=) 20 percent (%) from baseline in both the tender and swollen joint count and in at least 3 of the 5 assessments (patient's assessment of pain visual analog scale (VAS), patient's global assessment of disease activity VAS scale, physician's global assessment of disease activity VAS scale, health assessment questionnaire and C-reactive protein).

Secondary Outcome Measures

1. Proportion of Participants Who Achieve Psoriatic Area and Severity Index (PASI) 75 Response at Week 16 Among Participants with Baseline Body Surface Area (BSA) Greater Than Equal to (>=) 3 Percent (%) and an IGA Score of >=2 at Baseline
   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.
2. Proportion of Participants Who Achieve PASI 90 Response at Week 16 Among Participants with Baseline BSA >=3% and an IGA Score of >=2 at Baseline
   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.
3. Proportion of Participants Who Achieve PASI 100 Response at Week 16 Among Participants with Baseline BSA >=3% and an IGA Score of >=2 at Baseline
   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 100 response represents participants who achieved at least a 100 percent improvement from baseline in the PASI score.
4. Proportion of Participants with an Investigator Global Assessment (IGA) Psoriasis Score of 0 or 1 And >=2 Grade Improvement From Baseline at Week 16 Among Participants with Baseline BSA >=3% and an IGA Score of >=2 at Baseline
   Proportion of participants with an IGA psoriasis score of 0 or 1 and \>=2 grade improvement from baseline at week 16 among participants with \>=3% BSA and an IGA score of \>=2 at baseline will be reported. The IGA documents the investigator's assessment of the participant's psoriasis at a given time point. Overall lesions are graded for induration, erythema, and scaling, each using a 5-point scale: using 0 (no evidence), 1 (minimal), 2 (mild), 3 (moderate), and 4 (severe) scale. The IGA score of psoriasis is based upon the average of induration, erythema, and scaling scores. The participant's psoriasis is assessed as cleared (0), minimal (1), mild (2), moderate (3), or severe (4).
5. Proportion of Participants who Achieve an ACR 50 Response at Week 16
   The ACR 50 responders are participants with an improvement of \>= 50 % from baseline in both the tender and swollen joint count and in at least 3 of the 5 assessments (patient's assessment of pain VAS, patient's global assessment of disease activity VAS scale, physician's global assessment of disease activity VAS scale, health assessment questionnaire and C-reactive protein).
6. Proportion of Participants who Achieve an ACR 70 Response at Week 16
   The ACR 70 responders are participants with an improvement of \>= 70 % from baseline in both the tender and swollen joint count and in at least 3 of the 5 assessments (patient's assessment of pain VAS, patient's global assessment of disease activity VAS scale, Physician's global assessment of disease activity VAS scale, health assessment questionnaire and C-reactive protein).
7. Change From Baseline in Health Assessment Questionnaire-Disability Index (HAQ-DI) Score At Week 16
   The HAQ-DI score consists of questions referring to 8 categories: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and common daily activities. Responses in each functional area are scored from 0 to 3 (0=no difficulty and 3=inability to perform a task in that area). Overall score is computed as the sum of domain scores and divided by the number of domains answered. Total possible score range is 0-3 where 0 = least difficulty and 3 = extreme difficulty.
8. Changes From Baseline in 36-Item Short Form Survey (SF-36) Physical Component Summary (PCS) Score at Week 16
   SF-36 is a standardized survey evaluating 8 aspects of functional health and wellbeing: physical and social functioning, physical and emotional role limitations, bodily pain, general health, vitality, mental health. The score for a domain is an average of the individual question scores, which are scaled 0-100 (100=highest level of functioning). Score from physical function, role physical, bodily pain, and general health domains are averaged to calculate PCS. Total score range for PCS is 0-100 (100=highest level of physical functioning).
9. Proportion of Participants With Resolution of Enthesitis at Week 16 Among Those With Enthesitis at Baseline
   Enthesitis will be assessed using the Leeds Enthesitis Index (LEI). The LEI was developed to assess enthesitis in participants with PsA, and evaluates the presence (score of 1) or absence of pain (score of 0) by applying local pressure to lateral elbow epicondyle, left and right, medial femoral condyle, left and right, and achilles tendon insertion, left and right. LEI scores ranging from 0 (0 sites with tenderness) to 6 (worst possible score; 6 sites with tenderness). Resolution is defined as participants have enteritis (LEI score \>0) at baseline and no enthesis (LEO score =0) at the visit (week 16).
10. Change From Baseline in Enthesitis Score (LEI) at Week 16 in Participants With Enthesitis at Baseline
    Enthesitis will be assessed using the LEI. The LEI was developed to assess enthesitis in participants with PsA, and evaluates the presence (score of 1) or absence of pain (score of 0) by applying local pressure to Lateral elbow epicondyle, left and right, Medial femoral condyle, left and right, and Achilles tendon insertion, left and right. LEI total scores ranging from 0 (0 sites with tenderness) to 6 (worst possible score; 6 sites with tenderness).
11. Proportion of Participants With Resolution of Dactylitis at Week 16 Among Those With Dactylitis at Baseline
    Dactylitis is characterized by swelling of the entire finger or toe. The severity of dactylitis is scored on a scale of 0-3, where 0=tenderness and 3=extreme tenderness in each digit of the hands and feet. The range of total dactylitis scores for a participant is 0-60. Higher score indicates greater degree of tenderness. Resolution is defined as participants have dactylitis (score \>0) at baseline and no dactylitis (score =0) at the visit (week 16).
12. Change From Baseline in Dactylitis Score at Week 16 in Participants With Dactylitis at Baseline
    Dactylitis is characterized by swelling of the entire finger or toe. The severity of dactylitis is scored on a scale of 0-3, where 0=tenderness and 3=extreme tenderness in each digit of the hands and feet. The range of total dactylitis scores for a participant is 0-60. Higher score indicates greater degree of tenderness.
13. Proportion of Participants who Achieve Minimal Disease Activity (MDA) at Week 16
    MDA criteria are a composite of 7 outcome measures used in PsA. Participants are classified as achieving MDA if they fulfill 5 of 7 outcome measures: tender joint count less than or equal to (\<=) 1; swollen joint count \<= 1; psoriasis activity and severity index \<= 1 or body surface area \<= 3; patient pain VAS score of \<= 15; patient global disease activity VAS (arthritis and psoriasis) score of \<= 20; health assessment questionnaire (HAQ) score \<= 0.5; and tender entheseal points \<= 1.
14. Change From Baseline in Functional Assessment of Chronic Illness Therapy (FACIT)-Fatigue Score at Week 16
    The FACIT-fatigue is a self-administered, 13-item questionnaire measuring items on tiredness, weakness, and difficulty conducting usual activities due to fatigue. Responses to all items are rated on a 5-point likert response scale ranging from 0 "not at all" to 4 "very much." The total score ranges from 0 to 52, with higher values indicating less fatigue.