Skin thickness was assessed by the mRSS. The mRSS was rated with scores ranging from 0 (normal) to 3 (severe skin thickening) across 17 different sites. The total score was the sum of the individual skin scores in the 17 body areas (e.g., face, hands, fingers; proximal area of the arms, distal area of the arms, thorax, abdomen; proximal area of the legs, and distal area of the legs, feet), giving a range of 0-51 units and had been validated for participants with systemic sclerosis (SSc). A negative change from baseline showed improvement.

Intent-to-treat (ITT) population included all participants randomized who had received any study drug at the time of the Week 24 cutoff date (14 January 2014). Here, number of participants analyzed included only those participants who were evaluable for this outcome measure at any time point up to Week 24.

An AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. An SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent were events between first dose of study drug and up to Week 8 after last dose that were absent before treatment or that worsened relative to pretreatment state.

Safety population.

SHAQ-DI assessed five scleroderma-specific visual analogue scale (VAS) items to explore the impact of participant's disease. These items were developed to measure the effect of scleroderma on five elements of disease that could have a great impact on a participant's daily activities. Each VAS item was rated separately (0-100 millimeters [mm]), with higher scores indicating more severe disease. The five items were: 1) intestinal disease, 2) breathing problem, 3) Raynaud syndrome, 4) finger ulcers, and 5) overall disease.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified timeframe.

The HAQ-DI scale consisted of 20 questions referring to eight component sets: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and activities. The total score indicated the participant's self-assessed level of disability. There are four possible responses for each component: 0 = without any difficulty; 1 = with some difficulty; 2 = with much difficulty; 3 = unable to do. The HAQ-DI was the sum of the domain scores, divided by the number of domains that have a score (i.e. the average score), with total range of 0 to 3, higher scores showing larger functional limitation.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

The Clinician's Global Assessment evaluated the overall impact of SSc on the participant as assessed by the physician on a VAS with scores ranging from 0 to 100 mm, with higher scores indicating worse disease in terms of severity, damage, or overall disease, but there was no standardization for the scale.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

The Patient's Global Assessment was a patient's reported outcome that represented the participant's overall assessment of his or her current SSc on a 100 mm horizontal VAS scale (0 mm to 100 mm), with higher scores indicating worsening disease.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

This FACIT-Fatigue Scale was a 13-item measure with participants scoring each item on a 5-point scale (0 to 4) up to 52 points. The endpoint measured was fatigue. On this scale, a numerical increase indicated an improvement in the participant's condition.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

The 5-D Itch Scale contained five domains of duration, degree, direction, disability, and distribution. The endpoint of the scale was pruritus. Each domain was scored on a 5-point scale, the scores of each of the five domains were achieved separately and then summed together to obtain a total 5-D score. 5-D scores ranged between 5 (no pruritus) and 25 (most severe pruritus).

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

Skin thickness was assessed by the mRSS. The mRSS was rated with scores ranging from 0 (normal) to 3 (severe skin thickening) across 17 different sites. The total score was the sum of the individual skin scores in the 17 body areas (e.g., face, hands, fingers; proximal area of the arms, distal area of the arms, thorax, abdomen; proximal area of the legs, and distal area of the legs, feet), giving a range of 0-51 units and had been validated for participants with systemic sclerosis (SSc). A negative change from baseline showed improvement.

ITT population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure at specified time point up to 48 weeks.

Skin thickness was assessed by the mRSS. The mRSS was rated with scores ranging from 0 (normal) to 3 (severe skin thickening) across 17 different sites. The total score was the sum of the individual skin scores in the 17 body areas (e.g., face, hands, fingers; proximal area of the arms, distal area of the arms, thorax, abdomen; proximal area of the legs, and distal area of the legs, feet), giving a range of 0-51 units and had been validated for participants with systemic sclerosis (SSc). A negative change from baseline showed improvement. Percentage of participants with an improvement in mRSS at Week 24 (change from baseline <0) that maintained or further improved at Week 48 were reported as "Yes" and "No" with Yes = improvers at week 24 that had a change from baseline in mRSS at Week 48 <= change from baseline at Week 24.

ITT population. Here number of participants analyzed included those with mRSS change from baseline <0 at Week 24 and with non-missing change from baseline in mRSS at Week 48.

Joint tenderness was evaluated as per assessment of 28 joints. Joints on both sides of the body, including shoulders, elbows, wrists, 10 metacarpal phalangeal (MCP) joints, 10 proximal interphalangeal joint (PIP) joints, and both knees, were assessed. Joints were classified as not tender = 0 or tender = 1. Observed data was presented for this outcome measure.

ITT population. Here, "n" = participants evaluable for the specific item at specified time point in specified time frame.

AUC was a measure of the serum concentration of the drug over time which was measured in micrograms times (*) hour per milliliters (µg*hr/mL). It is used to characterize drug absorption.

Pharmacokinetic (PK) population included all participants who received at least one TCZ injection and had at least one PK sample with detectable results. Here, "n" = participants evaluable for the specific item at specified time point in specified time frame.

Observed data was presented for this outcome measure.

Safety population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

Observed data was presented for this outcome measure.

Safety population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure and "n" included those who were evaluable for the specific item at specified time point in specified time frame.

Safety population. Here, number of participants analyzed included only those participants who were evaluable for this outcome measure.