Airway obstruction among high school students.
D000293:Adolescent; D000402:Airway Obstruction / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D009329:Nebraska; D012737:Sex Factors; D012907:Smoking; D013147:Spirometry; D013334:Students; D014797:Vital Capacity