The DAPSA score will be calculated by the data collection tool and is the sum of the following: Participant's assessment of pain on VAS (in centimeters), Participant's Global Assessment of Disease Activity on VAS, 66 and 68 joint counts for swelling and tenderness, respectively. Cut-off values for low and high disease activity are <= 14 and > 28 points, respectively, and for remission is <= 4 points.

Physician's and Patient's Global Assessment of Disease Activity (PGA) are measured using a visual analogue scale with scores ranging from 0 to 100 (higher scores indicate worse disease activity).

The PtGA VAS is a self-administered assessment with scores ranging from "very well" (0 mm) to "very poor" (100 mm) that assesses disease activity over the past week. Proposed categories for interpretation of the VAS score: <10 mm, low disease activity; >= 10 millimeter (mm) but <30 mm moderate disease activity; >= 30 mm but <60 mm high disease activity; >= 60 mm very high disease activity.

The total number of digits of the hands and feet (that is, 0 to 20) with dactylitis will be evaluated.

Enthesitis will be documented using the Leeds Enthesitis Index (LEI). The LEI examination points include the lateral epicondyle (left and right), medial femoral condyle (left and right), and Achilles tendon insertion (left and right).

Nail involvement will be evaluated by recording the total number of nails of the hands and feet (that is, 0 to 20) with PsA involvement.

C-Reactive Protein will be evaluated to measure the inflammation.

Erythrocyte Sedimentation Rate will be evaluated to measure the inflammation.

Psoriasis skin involvement will be documented using categories: <3 percentage (%), 3% to 10%, and >10% of BSA. The typical method to assess BSA is to consider the surface area of the participant's handprint (palm and fingers) as representing 1% of the body's surface area.

Psoriasis skin involvement will be documented using categories: <3%, 3% to 10%, and >10% of BSA. The typical method to assess BSA is to consider the surface area of the participant's handprint (palm and fingers) as representing 1% of the body's surface area.

The EQ-5D-3L is a standardized measure of health status developed by the EuroQoL Group to provide a simple, generic measure of health for clinical and economic appraisal. Applicable to a wide range of health conditions and treatments, it provides a simple descriptive profile and a single index value for health status that can be used in the clinical economic evaluation of health care. The EQ 5D-3L descriptive system comprises the following 5 dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 3 levels: no problems, some problems, severe problems.

The Stanford Health Assessment Questionnaire Disability Index (HAQ-DI) is a participant completed questionnaire specific for rheumatoid arthritis, consisting of 20 questions in 8 domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip and common daily activities. There are 4 possible responses for each question: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty and 3=unable to do. The score for each of the domains is the highest (worst) score in each domain. A participant must have a domain score for at least 6 of 8 domains to calculate a valid HAQ-DI score which is the sum of domain scores, divided by the number of domains that have a score for a total possible score minimum/maximum 0 (best) to 3 (worst). A negative change from Baseline indicated improvement.

The Stanford Health Assessment Questionnaire Disability Index (HAQ-DI) is a participant completed questionnaire specific for rheumatoid arthritis, consisting of 20 questions in 8 domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip and common daily activities. There are 4 possible responses for each question: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty and 3=unable to do. The score for each of the domains is the highest (worst) score in each domain. A participant must have a domain score for at least 6 of 8 domains to calculate a valid HAQ-DI score which is the sum of domain scores, divided by the number of domains that have a score for a total possible score minimum/maximum 0 (best) to 3 (worst). A negative change from Baseline indicated improvement.

The PsAID-12 is a validated, self-administered questionnaire developed by EULAR for use in clinical practice that assesses the impact of PsA on participants' lives. It consists of 12 questions, each answered using a numerical rating scale. Questions related to pain, skin problems, work and/or leisure activities, discomfort, embarrassment and/or shame, social participation, and anger, fear, and uncertainty; and depression are scored from 0 (none) to 10 (extreme), functional capacity and sleep disturbance are scored from 0 (no difficulty) and 10 (extreme difficulty) and coping is scored from 0 (very well) 10 (very poorly).

The pain VAS is a self-administered assessment of average pain during the past week. The scale ranges from "no pain" (0 mm) to "the worst possible pain" (100 mm). This assessment should be completed prior to the tender and swollen joint examination.

The BASDAI participant rated components over last 48 hours using 100 mm Visual Analog Scale; components 15: range 0=none to 100=very severe; component 6: range:0=0 hours to 100=2 hours or more. 1) Overall level of fatigue/tiredness experienced; 2) Overall level of AS neck,back or hip pain experienced; 3) Overall level of pain/swelling in joints other than neck, back or hips; 4) Overall level of discomfort from any areas tender to touch or pressure; 5) Overall level of morning stiffness from time of awakening; 6) Duration of morning stiffness from time of awakening, and morning stiffness sub-scale.

The WPAI:PsA is a validated, self-administered questionnaire that assesses work and activity impairment during the past 7 days. The WPAI:PsA produces 4 types of scores: absenteeism (work time missed), presenteeism (impairment at work/reduced on the job effectiveness), work productivity loss (overall work impairment/absenteeism plus presenteeism), and activity impairment. The WPAI: PsA outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, that is, worse outcomes.

Change in the employment status of participants will be evaluated.