EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/ neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

The intent-to-treat population for the main study (ITT_M) includes all participants who were randomized in the main study (adults and adolescents). Non-responder imputation incorporating multiple imputation to handle missing data due to coronavirus disease 2019 pandemic (COVID-19) (NRI-C) was used.

The pre-specified primary analysis included participants enrolled in the main study only; Efficacy analyses of adolescent participants were conducted separately and are reported below.

The vIGA-AD is a validated assessment instrument to rate the severity of atopic dermatitis globally, based on the following scale:

• 0 - Clear: No inflammatory signs of AD;
• 1 - Almost clear: Barely perceptible erythema, induration/papulation and/or lichenification, no oozing or crusting;
• 2 - Mild: Slight but definite erythema, induration/papulation and/or minimal lichenification, no oozing or crusting;
• 3 - Moderate: Clearly perceptible erythema, induration/papulation and/or lichenification, oozing or crusting may be present;
• 4 - Severe: Marked erythema, induration/papulation and/or lichenification; Oozing or crusting may be present.

Intent-to-treat population for the main study; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst Pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for the main study with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

Intent-to-treat population for the main study; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst Pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for the main study with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An EASI 75 response is defined as at least a 75% reduction (improvement) from Baseline in EASI score.

Intent-to-treat population for the main study; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst Pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for the main study with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11- point scale from 0 (no itch) to 10 (worst imaginable itch). The percentage of participants who had a 4-point or greater improvement from Baseline in Worst Pruritus NRS score at Day 2 was pre-specified as a ranked secondary endpoint for participants in the upadacitinib 30 mg group versus placebo group only.

Intent-to-treat population for the main study with Worst Pruritus NRS (daily score) ≥ 4 at Baseline; Non-responder imputation with no special data handling for missing data due to COVID-19 (NRI-NC) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch).

The percentage of participants who had a 4-point or greater improvement in Worst Pruritus NRS score from Baseline at Day 3 was pre-specified as a ranked secondary endpoint for participants in the upadacitinib 15 mg group versus placebo group only.

Intent-to-treat population for the main study with Worst Pruritus NRS (daily score) ≥ 4 at Baseline; Non-responder imputation with no special data handling for missing data due to COVID-19 (NRI-NC) was used.

A flare, characterized as a clinically meaningful worsening in EASI, is defined as an increase in EASI score of ≥ 6.6 points from Baseline during the double-blind treatment period and prior to use of any rescue medication. Flare was assessed in participants with an EASI score of 65.4 or less at Baseline.

Intent-to-treat population for the main study with an EASI score ≤ 65.4 at Baseline and at least one EASI post-baseline assessment prior to use of rescue medication.

The ADerm-IS is a 10-item patient reported outcome (PRO) questionnaire designed to assess a variety of impacts that participants experience from their AD.

The ADerm-IS sleep domain consists of 3 questions designed to assess the impact of AD on sleep on a daily basis over a 24-hour recall period. The items include difficulty falling asleep, impact on sleep, and waking at night. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The ADerm-IS sleep domain score is the sum of the 3 item scores and ranges from 0 (no impact) to 30 (worst impact). The ADerm-IS sleep domain was analyzed based on weekly rolling averages of daily scores.

The minimal clinically important difference for ADerm-IS sleep domain score is 12.

Intent-to-treat population for the main study with ADerm-IS Sleep Domain score ≥ 12 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-SS is an 11-item PRO questionnaire designed to assess signs and symptoms that patients may experience due to AD using a 24-hour recall period. For the skin pain item participants were asked on a daily basis to indicate how bad their worst skin pain due to AD was in the past 24 hours on an NRS from 0 (no pain) to 10 (worst imaginable pain). The ADerm-SS skin pain score was analyzed using weekly rolling averages of daily scores. The minimal clinically important difference for ADerm-SS skin pain score is 4.

Intent-to-treat population for the main study with ADerm-SS Skin Pain Score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-SS is an 11-item questionnaire designed to assess signs and symptoms that participants may experience due to AD using a 24-hour recall period. The 7-item total symptom score includes 7 symptoms (items 1-7 of the ADerm-SS), each assessed on a NRS from 0 (no symptom) to 10 (worst imaginable). The 7 symptoms included in the score are itch while asleep, itch while awake, skin pain (each assessed daily), skin cracking, skin cracking pain, dry skin, and skin flaking (assessed weekly). The TSS-7 score ranges from 0 to 70, with higher scores indicating worsening symptoms. The minimal clinically important difference for ADerm-SS TSS-7 is 28.

Intent-to-treat population for the main study with ADerm-SS TSS-7 ≥ 28 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-IS is a 10-item PRO questionnaire designed to assess a variety of impacts that participants experience from their AD.

ADerm-IS emotional state sums three items [Items 8-10] measuring self-consciousness, embarrassment, and sadness with a 7-day recall. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The emotional state domain score ranges from 0 to 30, where higher scores represent worst impact.

The minimal clinically important difference for ADerm-IS emotional state domain score is 11.

Intent-to-treat population for the main study with ADerm-IS Emotional State domain score ≥ 11 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-IS is a 10-item PRO questionnaire designed to assess a variety of impacts that participants experience from their AD.

ADerm-IS Daily Activities sums four items measuring limitations of household, physical, and social activities, and difficulty concentrating with a 7-day recall. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The daily activities domain score ranges from 0 to 40, where higher scores represent worst impact.

The minimal clinically important difference for the ADerm-IS daily activities domain score is 14.

Intent-to-treat population for the main study with ADerm-IS Daily Activities Domain Score ≥ 14 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

Intent-to-treat population for the main study; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst Pruritus NRS was analyzed based on weekly rolling averages of daily scores. A negative change from Baseline indicates improvement.

Intent-to-treat population for the main study with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements (MMRM) including observed measurements at all visits, except that measurements after any rescue medication were excluded.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1)] moderate [2], or severe [3]) for Redness (erythema, inflammation), Thickness (induration, papulation, swelling - acute eczema), Scratching (excoriation), and Lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease; a negative change from Baseline indicates improvement.

Intent-to-treat population for the main study with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements (MMRM) including observed measurements at all visits, except that measurements after any rescue medication were excluded.

The POEM is a 7-item, validated questionnaire used to assess disease symptoms in both children and adults.

Participants respond to 7 questions, including dryness, itching, flaking, cracking, sleep loss, bleeding, and weeping, each scored on a 5-point scale based on frequency of occurrence during the previous week: 0 = no days, 1 = 1 to 2 days, 2 = 3 to 4 days, 3 = 5 to 6 days, and 4 = all days. Item scores are added to provide a total score ranging from 0 (clear) to 28 (very severe atopic eczema). A change in POEM score of 3.4 points is considered the minimal clinically important difference.

Intent-to-treat population for the main study with POEM score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The DLQI is a 10-item validated questionnaire used to assess the impact of AD disease symptoms and treatment on quality of life (QoL). It consists of 10 questions evaluating impact of skin diseases on different aspects of a participant's QoL over the prior week, including symptoms and feelings, daily activities, leisure, work or school, personal relationships, and the side effects of treatment. Each item is scored on a 4-point scale (0 = not at all/not relevant; 1 = a little; 2 = a lot; and 3 = very much).

Item scores are added to provide a total score, ranging from 0 to 30, with higher scores indicating greater impairment of QoL.

the DLQI was administered to participants who were ≥ 16 (16 to 75) years old at the time of the Screening visit.

Intent-to-treat population for the main study who were ≥ 16 years old at Screening with DLQI score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

SCORAD is a clinical tool used to assess the extent and severity of eczema (SCORing Atopic Dermatitis). The extent is assessed using the rule of 9 to calculate the affected area (A) as a percentage of the whole body (0-100%). The intensity part of the SCORAD (B) consists of 6 items: erythema, oedema/papulation, excoriations, lichenification, oozing/crusts and dryness, each graded on a scale from 0 (none) to 3 (severe), for a total score of 0 to 18. Subjective items (C) include daily pruritus and sleeplessness, each scored on a visual analogue scale (VAS) from 0 to 10 (total score 0-20). SCORAD is calculated as A/5 + 7B/2 + C, and ranges from 0 to 103 (worst). A negative change from Baseline indicates improvement.

Intent-to-treat population for the main study with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements (MMRM) including observed measurements at all visits, except that measurements after any rescue medication were excluded.

The HADS is a 14-item questionnaire, with seven items related to anxiety (HADS-A) and seven items related to depression (HADS-D). Each item is scored from 0 to 3; scores for each subscale range from 0 to 21, with higher scores indicating more distress. For each domain, scores 7 or lower are considered normal, 8 to 10 are borderline, and 11 or higher indicate clinical anxiety or depression.

Intent-to-treat population for the main study with HADS-A ≥ 8 or HADS-D ≥ 8 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The DLQI is a 10-item validated questionnaire used to assess the impact of AD disease symptoms and treatment on quality of life (QoL). It consists of 10 questions evaluating impact of skin diseases on different aspects of a participant's QoL over the prior week, including symptoms and feelings, daily activities, leisure, work or school, personal relationships, and the side effects of treatment. Each item is scored on a 4-point scale (0 = not at all/not relevant; 1 = a little; 2 = a lot; and 3 = very much).

Item scores are added to provide a total score, ranging from 0 to 30, with higher scores indicating greater impairment of QoL. A score of 0 or 1 means that the disease has no effect at all.

The DLQI was administered to participants who were ≥ 16 (16 to 75) years old at the time of the Screening visit.

Intent-to-treat population for the main study who were ≥ 16 years old at Screening with DLQI score > 1 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An EASI 75 response is defined as at least a 75% reduction (improvement) from Baseline in EASI score.

The ITT population for adolescents (ITT_A) consists of all adolescent participants who were randomized in the main study or the adolescent sub-study. Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The vIGA-AD is a validated assessment instrument to rate the severity of atopic dermatitis globally, based on the following scale:

• 0 - Clear: No signs of AD;
• 1 - Almost clear: Barely perceptible erythema, induration/papulation and/or lichenification, no oozing or crusting;;
• 2 - Mild: Slight but definite erythema, induration/papulation and/or minimal lichenification, no oozing or crusting;
• 3 - Moderate: Clearly perceptible erythema, induration/papulation and/or lichenification, possible oozing or crusting;
• 4 - Severe: Marked erythema, induration/papulation and/or lichenification; possible oozing or crusting.

The ITT population for adolescents; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for adolescents with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An EASI 90 response is defined as at least a 90% reduction (improvement) from Baseline in EASI score.

Intent-to-treat population for adolescents; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for adolescents with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An EASI 75 response is defined as at least a 75% reduction (improvement) from Baseline in EASI score.

The ITT population for adolescents; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst pruritus NRS was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for adolescents with Worst Pruritus NRS (weekly average) ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch).

Intent-to-treat population for adolescents with Worst Pruritus NRS (daily score) ≥ 4 at Baseline; Non-responder imputation with no special data handling for missing data due to COVID-19 was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch).

Intent-to-treat population for adolescents with Worst Pruritus NRS (daily score) ≥ 4 at Baseline; Non-responder imputation with no special data handling for missing data due to COVID-19 was used.

A flare, characterized as a clinically meaningful worsening in EASI, is defined as an increase in EASI score of ≥ 6.6 points from Baseline during the double-blind treatment period and prior to use of any rescue medication. Flares were assessed in participants with an EASI score of 65.4 or less at Baseline.

Intent-to-treat population for adolescents with an EASI score ≤ 65.4 at Baseline and at least one EASI post-baseline assessment prior to use of rescue medication.

The ADerm-IS is a 10-item patient reported outcome questionnaire designed to assess a variety of impacts that participants experience from their AD.

The ADerm-IS sleep domain consists of 3 questions designed to assess the impact of AD on sleep on a daily basis over a 24-hour recall period. The items include difficulty falling asleep, impact on sleep, and waking at night. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The ADerm-IS sleep domain score is the sum of the 3 item scores and ranges from 0 (no impact) to 30 (worst impact). The ADerm-IS sleep domain was analyzed based on weekly rolling averages of daily scores.

The minimal clinically important difference for ADerm-IS sleep domain score is 12.

Intent-to-treat population for adolescents with ADerm-IS Sleep Domain score ≥ 12 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-SS is an 11-item PRO questionnaire designed to assess signs and symptoms that patients may experience due to AD using a 24-hour recall period. For the skin pain item participants were asked to indicate on a daily basis how bad their worst skin pain due to AD was in the past 24 hours on an NRS from 0 (no pain) to 10 (worst imaginable pain).

The minimal clinically important difference for ADerm-SS skin pain score is 4. The ADerm-SS skin pain score was analyzed based on weekly rolling averages of daily scores.

Intent-to-treat population for adolescents with ADerm-SS Skin Pain score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-SS is an 11-item questionnaire designed to assess signs and symptoms that participants may experience due to AD using a 24-hour recall period. The 7-item total symptom score includes 7 symptoms (items 1-7 of the ADerm-SS), each assessed on a NRS from 0 (no symptom) to 10 (worst imaginable). The 7 symptoms included in the score are itch while asleep, itch while awake, skin pain (each assessed daily), skin cracking, skin cracking pain, dry skin, and skin flaking (assessed weekly). The TSS-7 score ranges from 0 to 70, with higher scores indicating worsening symptoms. The minimal clinically important difference for ADerm-SS TSS-7 is 28.

Intent-to-treat population for adolescents with ADerm-SS TSS-7 ≥ 28 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-IS is a 10-item PRO questionnaire designed to assess a variety of impacts that participants experience from their AD.

ADerm-IS emotional state sums three items [Items 8-10] measuring self-consciousness, embarrassment, and sadness with a 7-day recall. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The emotional state domain score ranges from 0 to 30, where higher scores represent worst impact.

The minimal clinically important difference for ADerm-IS emotional state domain score is 11.

Intent-to-treat population for adolescents with ADerm-IS Emotional State Domain score ≥ 11 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The ADerm-IS is a 10-item PRO questionnaire designed to assess a variety of impacts that participants experience from their AD.

ADerm-IS daily activities sums four items measuring limitations of household, physical, and social activities, and difficulty concentrating with a 7-day recall. Each question is scored on an 11-point NRS from 0 (no impact) to 10 (extreme impact). The daily activities domain score ranges from 0 to 40, where higher scores represent worst impact.

The minimal clinically important difference for the ADerm-IS daily activities domain score is 14.

Intent-to-treat population for adolescents with ADerm-IS Daily Activities Domain Score ≥ 14 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1], moderate [2], or severe [3]) for redness (erythema, inflammation), thickness (induration, papulation, swelling - acute eczema), scratching (excoriation), and lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease.

An EASI 100 response is defined as a 100% reduction (improvement) from Baseline in EASI score.

The ITT population for adolescents; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

Participants were asked to rate itch (pruritus) intensity at its worst during the past 24 hours on a daily basis using an 11-point scale from 0 (no itch) to 10 (worst imaginable itch). Worst Pruritus NRS was analyzed based on weekly rolling averages of daily scores. A negative change from Baseline indicates improvement.

Intent-to-treat population for adolescents with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements including observed measurements at all visits, except that measurements after any rescue medication were excluded.

EASI is a tool used to measure the extent (area) and severity of atopic eczema based on assessments of the head/neck, trunk, upper limbs and lower limbs. For each region the area score is recorded as the percentage of skin affected by eczema. For each region, the severity score is calculated as the sum of the intensity scores (scored as none [0], mild [1)] moderate [2], or severe [3]) for Redness (erythema, inflammation), Thickness (induration, papulation, swelling - acute eczema), Scratching (excoriation), and Lichenification (lined skin, prurigo nodules - chronic eczema).

The total EASI score for each region is calculated by multiplying the severity score by the area score, with adjustment for the proportion of the body region to the whole body. The final EASI score is the sum of the 4 region scores and ranges from 0 to 72 where higher scores represent worse disease; a negative change from Baseline indicates improvement.

Intent-to-treat population for adolescents with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements including observed measurements at all visits, except that measurements after any rescue medication were excluded.

The POEM is a 7-item, validated questionnaire used to assess disease symptoms in both children and adults. Participants respond to 7 questions, including dryness, itching, flaking, cracking, sleep loss, bleeding, and weeping, each scored on a 5-point scale based on frequency of occurrence during the previous week: 0 = no days, 1 = 1 to 2 days, 2 = 3 to 4 days, 3 = 5 to 6 days, and 4 = all days. Item scores are added to provide a total score ranging from 0 (clear) to 28 (very severe atopic eczema). A change in POEM score of 3.4 points is considered the minimal clinically important difference.

Intent-to-treat population for adolescents with POEM score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

The DLQI is a 10-item validated questionnaire used to assess the impact of AD disease symptoms and treatment on quality of life (QoL). It consists of 10 questions evaluating impact of skin diseases on different aspects of a participant's QoL over the prior week, including symptoms and feelings, daily activities, leisure, work or school, personal relationships, and the side effects of treatment. Each item is scored on a 4-point scale (0 = not at all/not relevant; 1 = a little; 2 = a lot; and 3 = very much).

Item scores are added to provide a total score, ranging from 0 to 30, with higher scores indicating greater impairment of QoL.

the DLQI was administered to participants who were ≥ 16 (16 to 75) years old at the time of the Screening visit.

Intent-to-treat population for adolescents who were ≥ 16 years old at Screening with DLQI score ≥ 4 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.

SCORAD is a clinical tool used to assess the extent and severity of eczema (SCORing Atopic Dermatitis). The extent is assessed using the rule of 9 to calculate the affected area (A) as a percentage of the whole body (0-100%). The intensity part of the SCORAD (B) consists of 6 items: erythema, oedema/papulation, excoriations, lichenification, oozing/crusts and dryness, each graded on a scale from 0 (none) to 3 (severe), for a total score of 0 to 18. Subjective items (C) include daily pruritus and sleeplessness, each scored on a visual analogue scale (VAS) from 0 to 10 (total score 0-20). SCORAD is calculated as A/5 + 7B/2 + C, and ranges from 0 to 103 (worst). A negative change from Baseline indicates improvement.

Intent-to-treat population for adolescents with non-missing Baseline and Week 16 values; missing data were handled using a mixed-effect model with repeated measurements including observed measurements at all visits, except that measurements after any rescue medication were excluded.

The HADS is a 14-item questionnaire, with seven items related to anxiety (HADS-A) and seven items related to depression (HADS-D). Each item is scored from 0 to 3; scores for each subscale range from 0 to 21, with higher scores indicating more distress. For each domain, scores 7 or lower are considered normal, 8 to 10 are borderline, and 11 or higher indicate clinical anxiety or depression.

Intent-to-treat population for adolescents with HADS-A ≥ 8 or HADS-D ≥ 8 at Baseline; Non-responder imputation incorporating multiple imputation to handle missing data due to COVID-19 (NRI-C) was used.