2.2 Definition of eczema
Physician-diagnosed eczema within the first 12 months of life, as reported by the child’s mother, were defined as eczema at age 1. At the two-year follow-up, physician-diagnosed eczema within the past 12 months, as reported by the mother, was defined as eczema at age 2. Study participants were divided into four groups based on eczema at age 1 and eczema at age 2, including no eczema, only eczema at age 1, only eczema at age 2, and persistent eczema.