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Results support the need for, acceptance of, and feasibility of providing integrated care for children with AD and their families. Changes to our clinical model based on study findings are discussed.

Background Few studies have examined how developing obesity in early adulthood affects the course of asthma. Objective We analyzed lung function and asthma impairment and risk among non-obese children with asthma, comparing those who were obese in young adulthood to those who remained non-obese. Methods Post-hoc analysis of 771 subjects with mild-moderate asthma who were not obese (pediatric definition, body mass index (BMI) <95th percentile) when enrolled in the Childhood Asthma Management Program at ages 5–12 years. Subjects were then followed to age ≥ 20 years. For visits at ages ≥ 20 years, spirometry values as percent predicted and recent asthma symptom scores and prednisone exposure were compared between 579 subjects who were non-obese at all visits and 151 who obese (adult definition of BMI ≥ 30 kg/m2) on at least one visit (median number of visits when obese = 4, IQR 2–7). Results Compared to participants who were non-obese (BMI 23.4 ± 2.6 kg/m2), those who became obese (BMI 31.5 ± 3.8 kg/m2) had significant decreases in FEV1/FVC (p<0.0003) and FEV1 (p = 0.001), without differences in FVC (p=0.15) during visits at ages ≥ 20 years. For each unit increase of BMI, FEV1 percent predicted decreased by 0.29 (p=0.0009). The relationship between BMI and lung function was not confounded by sex or BMI at baseline. Asthma impairment (symptom scores) and risk (prednisone use) did not differ between the two groups. Conclusion Becoming obese in early adulthood was associated with increased airway obstruction, without impact on asthma impairment or risk.

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