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Mean FEV1 (liters) for non-exposed and exposed subjects stratified by smoking status (never/ever smoker). The analysis was adjusted for sex, current smoking, packyears smoked, and centered for group specific (never/ever smokers) means for age, height and weight. A: In utero ETS (no/yes). B: daily ETS exposure (</≥1 hr). C: ETS exposure at the workplace (no/yes).
