Figure 3

FEV ₁ in year 0 BMI quartiles across three birth cohorts: 18–21 years, 22–26 years, and 27–30 years at baseline, based on repeated measures linear regression analysis and adjusted for race, sex, current age, smoking status at year 0, asthma status, time, physical activity score at year 0, and alcohol consumption at year 0. The slope of FEV₁ across time becomes increasingly negative with increasing year 0 BMI (p trend < 0.0001).