Percentage of participants achieving IGA of 0 or 1 with a ≥2 point improvement is presented. The IGA measures the investigator's global assessment of the participant's overall severity of their Atopic Dermatitis, based on a static, numeric 5-point scale from 0 (clear skin) to 4 (severe disease). The score is based on an overall assessment of the degree of erythema, papulation/induration, oozing/crusting, and lichenification.

All randomized participants in the double-blind treatment period.

Open label Pop PK: Cmax,ss was derived by a population pharmacokinetics approach.

All participants who received at least one dose of study drug in the PK Lead-in (PK LI) period and had evaluable PK data.

Open label Pop PK: AUCtau,ss was derived by a population pharmacokinetics approach.

All participants who received at least one dose of study drug in the PK Lead-in (PK LI) period and had evaluable PK data.

The EASI assesses objective physician estimates of 2 dimensions of atopic dermatitis - disease extent and clinical signs affected: 0 = 0%; 1 = 1-9%; 2 = 10-29%; 3 = 30-49%; 4 = 50-69%; 5 = 70-89%; 6 = 90-100% and the severity of 4 clinical signs: (1) erythema, (2) edema/papulation, (3) excoriation, and (4) lichenification each on a scale of 0 to 3 (0 = none, absent; 1 = mild; 2 = moderate; 3 = severe) at 4 body sites (head/neck, trunk, upper limbs, and lower limbs). Half scores are allowed between severities 1, 2, and 3. The final EASI score was obtained by weight-averaging these 4 scores and will range from 0 to 72 (severe). The EASI75 is defined as a ≥ 75% improvement from baseline in the EASI score.

The results were analyzed using non-responder imputation (NRI). All participants who either discontinued the study treatment or discontinued the study for any reason at any time were defined as non-responders for the NRI analysis for categorical variables such as EASI75.

All randomized participants in the double-blind treatment period.

The EASI assesses objective physician estimates of 2 dimensions of atopic dermatitis - disease extent and clinical signs affected: 0 = 0%; 1 = 1-9%; 2 = 10-29%; 3 = 30-49%; 4 = 50-69%; 5 = 70-89%; 6 = 90-100% and the severity of 4 clinical signs: (1) erythema, (2) edema/papulation, (3) excoriation, and (4) lichenification each on a scale of 0 to 3 (0 = none, absent; 1 = mild; 2 = moderate; 3 = severe) at 4 body sites (head/neck, trunk, upper limbs, and lower limbs). Half scores are allowed between severities 1, 2, and 3. The final EASI score was obtained by weight-averaging these 4 scores and will range from 0 to 72 (severe). The EASI90 is defined as a ≥ 90% improvement from baseline in the EASI score.

The results were analyzed using non-responder imputation (NRI). All participants who either discontinued the study treatment or discontinued the study for any reason at any time were defined as non-responders for the NRI analysis for categorical variables such as EASI90.

All randomized participants in the double-blind treatment period.

The EASI assesses objective physician estimates of 2 dimensions of atopic dermatitis - disease extent and clinical signs affected: 0 = 0%; 1 = 1-9%; 2 = 10-29%; 3 = 30-49%; 4 = 50-69%; 5 = 70-89%; 6 = 90-100% and the severity of 4 clinical signs (1) erythema (2)edema/papulation, (3) excoriation, and (4) lichenification each on a scale of 0 to 3 (0 = none, absent; 1 = mild; 2 = moderate; 3 = severe) at 4 body sites (head/neck, trunk, upper limbs, and lower limbs). Half scores are allowed between severities 1, 2 and 3. The final EASI score is obtained by weight-averaging these 4 scores and will range from 0 to 72 (severe).

Least Square (LS) Means were calculated using a mixed model repeated measures (MMRM) model with treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants in the double-blind treatment period and had evaluable EASI data.

The SCORAD index uses the rule of nines to assess disease extent and evaluates 6 clinical characteristics to determine disease severity: (1) erythema, (2) edema/papulation, (3) oozing/crusts, (4) excoriation, (5) lichenification, and (6) dryness on a scale of 0 to 3 (0=absence, 1=mild, 2=moderate, 3=severe). The SCORAD index also assesses subjective symptoms of pruritus and sleep loss with visual analog scale (VAS) where 0 is no itching or no trouble sleeping and 10 is unbearable itching or a lot of trouble sleeping. These 3 aspects: extent of disease (A: 0-1-2), disease severity (B: 0-18), & subjective symptoms (C: 0-20) combine using A/5 + 7*B/2+ C to give a maximum possible score of 103, where 0 = no disease and 103 = severe disease. The SCORAD75 responder is defined as a participant who achieves a ≥ 75% improvement from baseline in the SCORAD score.

All randomized participants in the double-blind treatment period.

The Itch Numeric Rating Scale (NRS) is a participant-administered, 11-point horizontal scale anchored at 0 and 10, with 0 representing "no itch" and 10 representing "worst itch imaginable." Overall severity of a participants itching is indicated by selecting the number, using a daily diary, that best describes the worst level of itching in the past 24 hours.

All randomized participants (≥10 to <18 years old) in the double-blind treatment period and with baseline itch score >= 4.

The EASI assesses objective physician estimates of 2 dimensions of atopic dermatitis - disease extent and clinical signs affected: 0 = 0%; 1 = 1-9%; 2 = 10-29%; 3 = 30-49%; 4 = 50-69%; 5 = 70-89%; 6 = 90-100%) and the severity of 4 clinical signs (erythema, edema/papulation, excoriation, and lichenification) each on a scale of 0 to 3 (0 = none, absent; 1 = mild; 2 = moderate; 3 = severe) at 4 body sites (head and neck, trunk, upper limbs, and lower limbs). Half scores are allowed between severities 1, 2 and 3. The final EASI score was obtained by weight-averaging these 4 scores and will range from 0 to 72 (severe). The EASI50 is defined as a ≥ 50% improvement from baseline in EASI score.

All randomized participants in the double-blind treatment period.

The IGA measures the investigator's global assessment of the participant's overall severity of their atopic dermatitis, based on a static, numeric 5-point scale from 0 (clear skin) to 4 (severe disease). The score is based on an overall assessment of the degree of erythema, papulation/induration, oozing/crusting, and lichenification.

All randomized participants in the double-blind treatment period.

The SCORAD index uses the rule of nines to assess disease extent and evaluates 6 clinical characteristics to determine disease severity: (1) erythema, (2) edema/papulation, (3) oozing/crusts, (4) excoriation, (5) lichenification, and (6) dryness on a scale of 0 to 3 (0=absence, 1=mild, 2=moderate, 3=severe). The SCORAD index also assesses subjective symptoms of pruritus and sleep loss with VAS where 0 is no itching or no trouble sleeping and 10 is unbearable itching or a lot of trouble sleeping. These 3 aspects: extent of disease (A: 0-1-2), disease severity (B: 0-18), & subjective symptoms (C: 0-20) combine using A/5 + 7*B/2+ C to give a maximum possible score of 103, where 0 = no disease and 103 = severe disease.

LS Means were calculated using a MMRM model with treatment, region, baseline disease severity (IGA), visit, and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants in the double-blind treatment period and had evaluable SCORAD data.

The SCORAD index uses the rule of nines to assess disease extent and evaluates 6 clinical characteristics to determine disease severity: (1) erythema, (2) edema/papulation, (3) oozing/crusts, (4) excoriation, (5) lichenification, and (6) dryness on a scale of 0 to 3 (0=absence, 1=mild, 2=moderate, 3=severe). The SCORAD index also assesses subjective symptoms of pruritus and sleep loss with VAS where 0 is no itching or no trouble sleeping and 10 is unbearable itching or a lot of trouble sleeping. These 3 aspects: extent of disease (A: 0-1-2), disease severity (B: 0-18), & subjective symptoms (C: 0-20) combine using A/5 + 7*B/2+ C to give a maximum possible score of 103, where 0 = no disease and 103 = severe disease. SCORAD90 is defined as a ≥ 90% improvement from baseline in the SCORAD score.

All randomized participants in the double-blind treatment period.

Body surface area affected by atopic dermatitis will be assessed for 4 separate body regions and is collected as part of the EASI assessment: head and neck, trunk (including genital region), upper extremities, and lower extremities (including the buttocks). Each body region will be assessed for disease extent ranging from 0% to 100% involvement. Overall percent BSA of all 4 body regions ranges from 0% to 100 % with higher values representing greater severity of atopic dermatitis. LS Means calculated using MMRM model with treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants in the double-blind treatment period and had evaluable BSA data.

Percentage of participants developing skin infections requiring antibiotic treatment

All randomized participants in the double-blind treatment period.

Mean number of days without use of background TCS was presented. The ANOVA model includes treatment, age cohort, region, and baseline disease severity (IGA) as factors.

All randomized participants in the double-blind treatment period.

The dispensed TCS tubes were weighed with cap (without the carton) to determine the dispensed amount of TCS in grams. Returned tubes were weighed with cap (without the carton) to determine the amount of TCS in grams used at each visit. Analysis was done via analysis of variance (ANOVA), with geographic region, baseline disease severity, and treatment as factors in the model.

All randomized participants in the double-blind treatment period.

The Itch NRS is a participant-administered, 11-point horizontal scale, with 0 representing "no itch" and 10 representing "worst itch imaginable." Overall severity of a participant's itching is indicated by selecting the number, using a daily diary, that best describes the worst level of itching in the past 24 hours.

LS Means were calculated using mixed model repeated measures (MMRM) model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (10 to <18 years) in the double-blind treatment period and had evaluable Itch NRS data.

The Parent-Reported Itch Severity Measure (PRISM) is a single-item, parent/caregiver administered scale that reports the overall severity of their child's itching. Parent/Caregiver's report the overall severity of their child's itching based on observed actions of the child in the past 24 hours. Response options range include "No Itch," "Mild," "Moderate," "Severe," and "Very Severe." The PRISM will be completed for participants <10 years old by the parent/caregiver.

LS Means were calculated using mixed model repeated measures (MMRM) model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (2 to <10 years old) in the double-blind treatment period and had evaluable PRISM data.

The POEM is a simple, 7-item, patient-administered scale that assesses disease severity in children and adults. Participants respond to questions about the frequency of 7 symptoms (itching, sleep disturbance, bleeding, weeping/oozing, cracking, flaking, and dryness/roughness) over the last week on a scale ranging from 0-4 (0 = no days, 1 = 1-2 days, 2 = 3-4 days, 3 = 5-6 days, 4 = everyday). Scores range from 0-28 with higher total scores indicating greater disease severity.

LS Means were calculated using MMRM model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants in the double-blind treatment period and had evaluable POEM data.

The PGI-S-AD is a single-item question asked to the participants on how they would rate their overall atopic dermatitis symptoms over the past 24 hours to evaluate the severity of the disease at that point in time. The 5 categories of responses range from "(0) no symptoms", "(1) very mild", "(2) mild" "(3) moderate", and "(4) severe".

LS Means were calculated using mixed model repeated measures (MMRM) model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (10 to <18 years old) in the double-blind treatment period and had evaluable PGI-S-AD data.

PROMIS is a set of person-centered measures that evaluates and monitors physical, mental and social health in adults and children. The PROMIS Depression item bank assesses self-reported negative mood (sadness, guilt), views on self (self-criticism, worthlessness), social cognition (loneliness, interpersonal alienation), decreased positive affect and engagement (loss of interest, meaning, and purpose). The PROMIS Depression Short Form (8a v2.0 and 6a v2.0) is available in pediatric self-report (ages 8 to <18 years) and for parents/caregivers serving as proxy reporters for children (ages 5 to <8 years). Children aged <5 years will not complete assessment. Both pediatric self-report and proxy-report versions assess depression "in past seven days." Response options range from 1 = Never;2 = Rarely;3 = Sometimes;4 = Often; to 5 = Almost always. Total raw scores were converted to T-Scores (mean= 50 and a standard deviation = 10) with higher scores representing greater depression.

All randomized participants (5 to <18 years old) in the double-blind treatment period and had evaluable (PROMIS) - Pediatric Depression data. LS Means were calculated using MMRM model, which includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline-by-visit-interaction as fixed continuous effects.

PROMIS is a set of person-centered measures that evaluates and monitors physical, mental, and social health in adults and children. The PROMIS Anxiety item bank assesses self-reported fear (fearfulness, panic), anxious misery (worry, dread), hyperarousal (tension, nervousness, restlessness), and somatic symptoms related to arousal (racing heart, dizziness). The PROMIS Anxiety Short Form (8 questions, 8a v2.0) is available in a pediatric self-report (ages 8 to <18 years) and for parents/caregivers serving as proxy reporters for their children (youth ages 5 to <8 years old). Children aged <5 years will not complete this assessment. Both pediatric self-report and proxy-report versions assess anxiety "in the past seven days." Response options range from 1= Never; 2 = Rarely; 3 = Sometimes; 4 = Often; to 5 = Almost always. Total raw scores were converted to T-Scores (mean = 50 and a standard deviation = 10) with higher scores representing greater anxiety.

All randomized participants (5 to <18 years old) in the double-blind treatment period and had evaluable (PROMIS) - Pediatric Anxiety data. LS Means were calculated using the MMRM model, which includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline-by-visit-interaction as fixed continuous effects.

CDLQI is a validated 10 question tool to measure impact of skin disease on QOL in children by assessing how much the skin problem has affected the subjects over past week. Nine questions were scored as follows: Very much = 3, Quite a lot = 2, Only a little = 1, Not at all or unanswered = 0. Question 7 has an added possible response, which was scored as 3. CDLQI equals the sum of the score of each question (max. = 30, min. = 0). Higher the score, the greater the impact on QOL. A negative change from baseline indicated improvement. LS Means were calculated using mixed model repeated measures (MMRM) model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (4 to <18 years old) in the double-blind treatment period and had evaluable CDLQI data.

Infants' Dermatitis Quality of Life Index (IDQOL) is used to evaluate quality of life for subjects of age less than 4 years. IDQOL questionnaires were designed for infants (below the age of 4 years) with atopic dermatitis. The IDQOL was calculated by summing the score of each question resulting in a maximum of 30 and a minimum of 0. The higher the score in each questionnaire, the more quality of life is impaired. A negative change from baseline indicated improvement. LS Means were calculated using mixed model repeated measures (MMRM) model includes treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (2 to <4 years old) in the double-blind treatment period and had evaluable IDQOL data.

The Atopic Dermatitis Caregiver (WPAI-AD-CG) assesses the effect of a child's atopic dermatitis on the parent/caregiver's work productivity during the past 7 days. The WPAI-AD consists of 6 items grouped in 4 domains: 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, that range from 0% to 100%, Scores are calculated as impairment percentages with higher scores indicating greater impairment and less productivity.

LS Mean were calculated using a MMRM model with treatment, baseline disease severity (IGA), visit, and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants in the double-blind treatment period and who had at least 1 post-baseline WPAI measure.

The EQ-5D-Y questionnaire is health status related and self-completed for pediatric participants ≥8 years old and completed by parents/caregivers for children 4 to <8 years old. Health state profile assessed health in 5 dimensions (Mobility,selfcare,usual activities,pain/discomfort, anxiety/depression) to obtain index score, each with three levels of response (no problems,some problems,a lot of problems). Participants indicated their health state by choosing appropriate level from each dimension. Visual analog scale on which participant rates their perceived health state from 0 ("worst health you can imagine") to 100 ("best health you can imagine") is presented.Higher the score the better the health status. LS Means uses MMRM model which includes treatment,age cohort,region,baseline disease severity(IGA),visit,treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (4 to <18 years old) in the double-blind treatment period with week 16 EQ-5D-Y data.

Atopic Dermatitis Sleep Scale (ADSS) is a 3-item, participant-administered questionnaire developed to assess the impact of itch on sleep including difficulty falling asleep, frequency of waking, and difficulty getting back to sleep last night. Item 2, frequency of waking last night is reported by selecting the number of times they woke up each night, ranging from 0 to 29 times, where the higher a number indicates a worse outcome. The ADSS is designed to be completed daily, using a daily diary, with respondents thinking about sleep "last night." Each item is scored individually.

LS Means were calculated using a MMRM model with treatment, region, baseline disease severity (IGA), visit, and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by- visit-interaction as fixed continuous effects.

All randomized participants (10 to <18 years old) in the double-blind treatment period with week 16 ADSS Item 2 (frequency of waking) data.

Skin Pain NRS is a participant-administered, 11-point horizontal scale anchored at 0 and 10, with 0 representing "no pain" and 10 representing "worst pain imaginable." Overall severity of a participant's skin pain is indicated by selecting the number, using a daily diary, that best describes the worst level of skin pain in the past 24 hours.

LS Means were calculated using a MMRM model with treatment, age cohort, region, baseline disease severity (IGA), visit, treatment-by-age cohort interaction and treatment-by-visit-interaction as fixed categorical effects and baseline and baseline-by-visit-interaction as fixed continuous effects.

All randomized participants (10 to <18 years old) in the double-blind treatment period with Week 16 Skin Pain NRS data.

The questionnaire for Suspension acceptability and palatability assessed the participants ability to swallow the oral suspension product, experience relating to the taste, smell and ease of administering and taking the suspension. The questionnaire contained following Questions: Question 1) How did you (your child) like the taste of the medicine? Question 2) How did you (your child) like the smell of the medicine? Question 3) How easy was it for you (your child) to take the medicine today? Question 4) How easy was it for you to use the oral syringe to give your child the dose today? Responses: Liked Very Much, Liked, Neither Liked nor Disliked, Disliked, Disliked Very Much, Very Easy, Easy, Neither Easy nor Hard, Difficult (or Hard) and Very Difficult (or Hard). The number of participants with these responses are presented. Data is presented as "Question Number-Response-Time point".

All PK lead-in participants (2 to <10 years old) with data for suspension acceptability and palatability assessment at given time point.

The questionnaire for tablet acceptability and palatability assessed the participants ability to swallow the tablet. The questionnaire contained the question 1) How easy was it for you (your child) to swallow the medicine today? Responses: Very Easy, Easy, Neither Easy nor Hard, Difficult (or Hard) and Very Difficult (or Hard). The number of participants with these responses are presented. Data is presented as "Question Number-Response-Time point".

All PK Lead-In participants >=10 years old, who had data for tablet acceptability and palatability at given time point.

Height, Weight and BMI Growth Rate will be reported.

Number of participants with change of IgG titers for tetanus vaccine and pneumococcal conjugate will be presented. A primary immune response was assessed in participants who had never received tetanus or pneumococcal conjugate vaccines previously and secondary/booster responses were assessed if the participants had previously received the vaccines. For pneumococcal conjugate vaccine, number of participants with >= 2-fold increase in >=6 pneumococcal serotypes from pre-vaccination timepoint to specified post-vaccination timepoints through the end of the study will be presented. For tetanus vaccine, number of participants with >= 2-fold increase in participants with baseline titer >=0.1 IU/mL from pre-vaccination timepoint to specified post-vaccination timepoints through the end of the study will be presented.

Pop PK: Cmax,ss was derived by a population pharmacokinetics approach.

All participants who received at least one dose of study drug in the open-label PK lead-in and double-blind treatment period and had evaluable PK data.

Pop PK: AUCtau,ss was derived by a population pharmacokinetics approach.

All participants who received at least one dose of study drug in the open-label PK lead-in and double-blind treatment period and had evaluable PK data.