Risk Factors and Age-Related Patterns of Asthma-Like Symptoms in Early Childhood.

Background: Episodes of asthma-like symptoms in young children are common, but little is known about risk factors and their patterns for the daily symptom burden.

Objective: We investigated a variety of possible risk factors and their age-related impact on the number of asthma-like episodes during age 0 to 3 years.

Methods: The study population included 700 children from the Copenhagen Prospective Studies on Asthma in Childhood mother-child cohort followed prospectively from birth.