A patient will be considered as improved according the ACR20 criteria if she/he has at least 20% decrease in the swollen and tender joint count, and at least 20% improvements in 3 of the following 5 criteria: physical disability on the Health Assessment Questionnaire; pain score on a visual analog scale; patient global assessment; physician global assessment; and acute phase reactant [either erythrocyte sedimentation rate (ESR) or high sensitivity C-reactive protein (hsCRP)]

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

A patient will be considered as improved according the ACR50 criteria if she/he has at least 50% decreases in the swollen and tender joint count, and at least 50% improvements in 3 of the following 5 criteria: physical disability on the Health Assessment Questionnaire; pain score on a visual analog scale; patient global assessment; physician global assessment; and acute phase reactant [either erythrocyte sedimentation rate (ESR) or high sensitivity C-reactive protein (hsCRP)]

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

DAS28-CRP is a measure of disease activity based on 28-Swollen and Tender Joint Count [proximal interphalangeal joints (10 joints) metacarpophalangeal joints (10) wrists (2) elbows (2) shoulders (2) knees (2)], CRP, and the Patient's Global Assessment of disease activity. Values range from 2.0 to 10.0 where higher values mean a higher disease activity. DAS28-CRP < 2.6 is interpreted as remission.

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

PASI takes into account the extent of the disease, as well as the severity of erythema, scaling, and thickness in different body areas affected by psoriasis. A PASI75 represents an improvement in the PASI score of at least 75% as compared with baseline.

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

SF-36 is a 36 item questionnaire which measures Quality of Life across eight domains, which are both physically and emotionally based. Two overall summary scores, the Physical Component Summary (PCS) and Mental Component Summary (MCS) can be computed. In this study, SF-36 PCS is used to assess improvement from baseline of at least one dose of secukinumab versus placebo. The SF-36 is a validated instrument measuring health-related quality of life across multiple disease states. It has 36 questions with 8 subscale scores and 2 summary scores (1) physical component summary=physical functioning, role-physical, bodily pain, and general health. There is no total overall score; scoring is done for both subscores and summary scores. For subscores and summary scores, 0 =worst score (or quality of life) and 100=best score. Change from Baseline= post-Baseline - Baseline value.

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

PASI takes into account the extent of the disease, as well as the severity of erythema, scaling, and thickness in different body areas affected by psoriasis. A PASI90 represents an improvement in the PASI score of at least 90% as compared with baseline.

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

The HAQ measures physical disability and functional status. It has 4 dimensions: disability, pain, drug side effects and dollar costs. In this trial, only the disability dimension was used. The disability dimension consists of 20 multiple choice items concerning difficulty in performing 8 common activities of daily living; dressing and grooming, arising, eating, walking, reaching, personal hygiene, gripping and activities. Participants choose from four response categories: 0 (without any difficulty), 1 (with some difficulty), 2 (with much difficulty) and 3 (unable to do). Within each of the 8 categories, only the item indicating the most severe impairment contributes to the category score. The HAQ score is calculated by summing the computed scores for each category and dividing by the number of categories answered. It ranges from 0 (without any difficulty) to 3 (unable to do). A negative change from baseline indicates improvement.

The Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value, was considered.

The presence of dactylitis was assessed by dactylitis count (number of fingers and toes with dactylitis, with a range of 0-20). If dactylitis is present with any finger or toe, the patient is counted as a patient with dactylitis.

The Dactylitis subset of the Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value at Baseline and post-basline, was considered.

The presence of Enthesitis was assessed using a validated enthesitis index that uses 6 sites for evaluation of enthesitis: lateral epicondyle humerus L + R, proximal achilles L + R and medial condyle femur. If enthesitis is present at any of the 6 sites, the subject is counted as a subject with enthesitis.

The Enthesitis subset of the Full Analysis Set (FAS) based on Primary Analysis, which consisted of all participants with an observed value at Baseline and post-basline, was considered.

Analysis of frequencies for treatment emergent Adverse Event (AE), Serious Adverse Event (SAE) and Deaths by primary System Organ Class (SOC).

Safety Set, based on Final Analysis. All subjects who took at least one dose of study treatment during the treatment period. A subject with multiple adverse events within a primary system organ class was counted only once in the total row. Deaths up to 28 days after the last dose are included. Only descriptive analysis done.