Prevalence and resemblance between twins for asthma-related phenotypes at age 3 years.

MZ = monozygotic, DZ = dizygotic.*584 subjects with zygosity confirmed by DNA testing were used in this analysis.MZ为同卵双生子（monozygotic），DZ为异卵双生子（dizygotic）。本次分析共纳入584名经DNA检测确认合子型的受试者。