Figure 2

Differential risk of developing current high-risk childhood asthma in relationship to infant age at the winter virus peak. Results were obtained from a multivariable logistic regression model adjusted for gender, infant race, birth weight, gestational age, number of living siblings, region of residence, maternal smoking, marital status, maternal education, and season. (A) Predicted probability and 95% confidence intervals (CI) of developing current high-risk childhood asthma by infant age in months at the winter virus peak (${\chi }_3^2$ = 49.05; P < 0·001). The area under the curve is equal to the asthma prevalence of the population. (B) Adjusted odds ratio and 95% CI of developing current high-risk childhood asthma relative to children who were 12 months of age at the winter virus peak. Infants who were 1 year of age at the winter virus peak served as the reference group. Reprinted with permission from Wu et al, Am J Respir Crit Care Med 178:1123–1129, 2008.