Plaque Psoriasis: Usability of the Risankizumab Autoinjector Combination Product in Adults With Moderate to Severe Psoriasis

Percentage of Participants With an Observer Rating of Successful Participant Self-administration

时间窗: Day 1 and Week 28

Successful participant self-administration is defined as successfully completed the sequence of 4 critical steps in the Instructions for Use (IFU) without errors to administer study drug via the autoinjector. The steps are "chose an appropriate injection site"; "removed cap from autoinjector"; "activated the injection"; and "performed a complete injection".

Percentage of Participants Achieving Psoriasis Area Severity Index (PASI) 90 at Week 16

时间窗: At Week 16

The Psoriasis Area and Severity Index (PASI) is a composite score based on the degree of effect on body surface area of psoriasis and the extension of erythema (reddening), induration (thickness), desquamation (scaling) of the lesions and area affected as observed on the day of examination. The severity of each sign was assessed using a 5-point scale, where 0=no symptoms, 1=slight, 2=moderate, 3=marked, 4=very marked. The PASI score ranges from 0 to 72, where 0 indicates no psoriasis and 72 indicates very severe psoriasis. PASI 90 is defined as at least a 90% reduction in PASI score compared with the Baseline PASI score. The percent reduction in score is calculated as (PASI score at Baseline - score at Week 16) / PASI score at Baseline \* 100.

Percentage of Participants Achieving Static Physician Global Assessment (sPGA) of Clear or Almost Clear at Week 16

时间窗: At Week 16

The sPGA is an assessment by the investigator of the overall disease severity at the time of evaluation. Erythema, induration, and scaling of psoriatic lesions are scored on a 5-point scale ranging from 0 (none) to 4 (severe). The sPGA ranges from 0 to 4, and is calculated as Clear (0) = 0 for all three; Almost clear (1) = mean \>0, \<1.5; Mild (2) = mean ≥1.5, \<2.5; Moderate (3) = mean ≥2.5, \<3.5; and Severe (4) = mean ≥3.5.

Percentage of Participants Achieving Psoriasis Area Severity Index (PASI) 100 at Week 16

时间窗: At Week 16

The Psoriasis Area and Severity Index (PASI) is a composite score based on the degree of effect on body surface area of psoriasis and the extension of erythema (reddening), induration (thickness), desquamation (scaling) of the lesions and area affected as observed on the day of examination. The severity of each sign was assessed using a 5-point scale, where 0=no symptoms, 1=slight, 2=moderate, 3=marked, 4=very marked. The PASI score ranges from 0 to 72, where 0 indicates no psoriasis and 72 indicates very severe psoriasis. PASI 100 is defined as a 100% reduction in PASI score compared with the Baseline PASI score. The percent reduction in score is calculated as (PASI score at Baseline - score at Week 16) / PASI score at Baseline \* 100.

Percentage of Participants Achieving Psoriasis Area Severity Index (PASI) 75 at Week 16

时间窗: At Week 16

The Psoriasis Area and Severity Index (PASI) is a composite score based on the degree of effect on body surface area of psoriasis and the extension of erythema (reddening), induration (thickness), desquamation (scaling) of the lesions and area affected as observed on the day of examination. The severity of each sign was assessed using a 5-point scale, where 0=no symptoms, 1=slight, 2=moderate, 3=marked, 4=very marked. The PASI score ranges from 0 to 72, where 0 indicates no psoriasis and 72 indicates very severe psoriasis. PASI 75 is defined as at least a 75% reduction in PASI score compared with the Baseline PASI score. The percent reduction in score is calculated as (PASI score at Baseline - score at Week 16) / PASI score at Baseline \* 100.

Percentage of Participants Who Had No Potential Hazards as Measured by an Observer

时间窗: Day 1 and Week 28

Potential hazards are measured by an observer on the possible use-related hazards checklist for self-administration with the autoinjector. Hazards include injection at incorrect site; administration delayed because of cap removal difficulties; slip hazard during cap disposal attempt; small component swallowed after incorrect disposal of cap; patient received less medication than intended; needle shield did not deploy and resulted in sharps exposure; and pen not discarded properly and resulted in a biohazard for others.

Participant Rating of Acceptability by the Self-Injection Assessment Questionnaire (SIAQ)

时间窗: Day 1, Week 4, Week 16, Week 28

Participants completed the Self-Injection Assessment Questionnaire (SIAQ), an instrument previously validated in those with rheumatoid arthritis, on an electronic patient-report outcome (ePRO) device. The POST module includes four principal causal domains: feelings about injections, self-confidence, pain and reaction during or after the injection, and ease of use, plus two additional domains on satisfaction with self-injection and self-image. Participants rate each item of the SIAQ 20 to 40 minutes following injections, and the ratings are transformed to scores ranging from 0 (worst experience) to 10 (best experience). The domain score is the mean of the item scores included in the domain. Higher domain scores indicate wider acceptability by subjects to use the autoinjector.