Characteristics of the individuals in the selected study groups, the clinical groups from which they were selected and the cohort from which they derived.

†Fulfilling at least one of the following criteria; wheeze in the past year, asthma inhalation treatment, or an affirmative answer to the question: “Have you had any signs of pollen allergy or allergy to furred pets during the last 12 months?”, diagnosed at 13 years of age. *Defined as a pruritic, chronic or chronically relapsing non-infectious dermatitis with typical features and distribution and fulfilling at least three of the main criteria defined by Hanifin and Rajka [22], diagnosed at 13 years of age. ¤Response to questionnaire distributed at 1 year of age. §Defined as an affirmative answer to the question “Has the child's mother/father ever had asthma, hay fever or eczema?” answered at 13 years of age. ¥Answered at 4 years of age.

† 满足以下任意一项即可判定：过去1年内出现过喘息症状、接受过哮喘吸入治疗，或对“过去12个月内是否出现过花粉过敏或带毛宠物过敏症状？”这一问题给出肯定答复，且确诊年龄为13岁。* 定义为伴有典型特征与分布的瘙痒性、慢性或慢性复发性非感染性皮炎，且满足Hanifin与Rajka[22]提出的主要标准中的至少三项，确诊年龄为13岁。¤ 对应1岁时发放的调查问卷的应答结果。§ 定义为在13岁时回答“孩子的母亲/父亲曾患有哮喘、花粉症或湿疹？”这一问题时给出肯定答案。¥ 为4岁时完成的作答内容。