The EASI score is used to measure the severity and extent of atopic dermatitis (AD) and measured erythema, infiltration, excoriation and lichenification on 4 anatomic regions of the body: head, trunk, upper and lower extremities. The total EASI score ranges from 0 (minimum) to 72 (maximum) points, with the higher scores reflecting the worse severity of AD. EASI-75 responders were the participants who achieved ≥75% overall improvement in EASI score from baseline to Week 16. The analysis population for efficacy analyses is the Full Analysis Set (FAS) which included all randomized participants. Efficacy analyses were based on the treatment allocated (as randomized).

Peak serum concentration after multiple doses of dupilumab administered using the PFP (test) relative to the prefilled syringe (reference)

Drug concentration in serum after multiple doses of dupilumab administered using the PFP (test) relative to the prefilled syringe (reference)

The EASI score was used to measure the severity and extent of AD and measured erythema, infiltration, excoriation and lichenification on 4 anatomic regions of the body: head, trunk, upper and lower extremities. The total EASI score ranges from 0 (minimum) to 72 (maximum) points, with the higher scores reflecting the worse severity of AD. Difference of percent change in EASI between current study baseline and week 36 in from parent study baseline (NCT02277743 and NCT02277769) was reported. Values after first rescue treatment used were set to missing before multiple imputation (MI).

The EASI score was used to measure the severity and extent of AD and measured erythema, infiltration, excoriation and lichenification on 4 anatomic regions of the body: head, trunk, upper and lower extremities. The total EASI score ranges from 0 (minimum) to 72 (maximum) points, with the higher scores reflecting the worse severity of AD. EASI-75 responders were the participants who achieved \>=75% overall improvement in EASI score at Week 36. Values after first rescue treatment used were set to missing. Patients with missing value at week 36 were considered as a non-responder.

IGA is an assessment scale used to determine severity of AD and clinical response to treatment on a 5-point scale (0 = clear; 1 = almost clear; 2 = mild; 3 = moderate; 4 = severe) based on erythema and papulation/infiltration. Therapeutic response is an IGA score of 0 (clear) or 1 (almost clear). Participants with IGA score "0" or "1" and a reduction from baseline of ≥2 points at Week 16 were reported.

Adverse events of special interest in this study include: Anaphylactic reactions, Systemic hypersensitivity reactions, Helminthic infections, Any severe type of conjunctivitis or blepharitis, Keratitis, Clinically symptomatic eosinophilia (or eosinophilia associated with clinical symptoms)

Peak dupilumab concentration in serum following single dose administration. Analysis was performed on PK analysis set that included all treated subjects who received the study medication and had at least 1 quantified (non-missing) result for dupilumab concentration following the first dose of the study drug.

Mean AUC estimates were calculated using mean concentration data at each time point, using a non-compartmental approach (NCA). Calculated AUClast (computed from time zero to the time of the last positive concentration) are presented. Analysis was performed on PK analysis set that included all treated subjects who received the study medication and had at least 1 quantified (non-missing) result for dupilumab concentration following the first dose of the study drug.

Analysis was performed on PK analysis set that included all treated subjects who received the study medication and had at least 1 quantified (non-missing) result for dupilumab concentration following the first dose of study drug.

A positive response was defined as a ≥ 4-fold increase from pre-vaccination at baseline in anti-tetanus immunoglobulin G (IgG) titer for participants with a pre-vaccination tetanus antibody titers ≥ 0.1 IU/ml or a titer of ≥ 0.2 IU/ml for participants with pre-vaccination titers of \<0.1 IU/ml. There was no planned statistical hypothesis testing regarding the difference in immune response between the 2 treatment groups for this study, therefore no formal statistical hypothesis between groups was performed.

The EASI score was used to measure the severity and extent of atopic dermatitis (AD) and measures erythema, infiltration, excoriation and lichenification on 4 anatomic regions of the body: head, trunk, upper and lower extremities. The total EASI score range from 0 (minimum) to 72 (maximum) points, with the higher scores reflecting the worse severity of AD.

Any untoward medical occurrence in a subject who received investigational medicinal product (IMP) was considered an AE without regard to possibility of causal relationship with this treatment. Treatment-emergent adverse events (TEAEs) were defined as AEs that developed or worsened or became serious during on-treatment period (from start of administration of first dose of study drug to the end of study \[up to Day 78\]). A serious adverse event (SAE) was defined as any untoward medical occurrence that resulted in any of following outcomes: death, life-threatening, required initial or prolonged in-patient hospitalization, persistent or significant disability/incapacity, congenital anomaly/birth defect, or considered as medically important event. Any TEAE included participants with both serious and non-serious AEs.

The EASI score was used to measure the severity and extent of AD and measured erythema, infiltration, excoriation and lichenification on 4 anatomic regions of the body: head, trunk, upper and lower extremities. The total EASI score ranges from 0 (minimum) to 72 (maximum) points, with the higher scores reflecting the worse severity of AD. The efficacy data were set to be missing after use of rescue medication and after early termination visit for participants who prematurely discontinued study treatment. All missing values were imputed by LOCF.