Fig. 3

Forest plot of the subgroup analysis of the association between waist circumference and asthma attack probability based on logistic regression analysis across sex (male or female), age (< 45 or ≥ 45 years), and current smoking (not at all, some days or every day). The association was adjusted for waist circumference, age, race, education, and current smoking status. OR: Odds ratio; CI: Confidence interval