RESULTS: Analyses were limited to 130 participants with data on bronchitis, spirometry and IOS measures at age 32 years. The prevalence of bronchitis was 10% (13/130) and 9 of the 13 participants who reported bronchitis consulted a physician for their illness. Participants with bronchitis had significantly increased resistance at 5, 10, and 15Hz by 0.83 (p=0.004), 0.73 (p=0.01), and 0.65 (p=0.03) standard deviations, respectively, and decreased reactance at 5Hz by -0.75 (p=0.01) standard deviations compared to healthy participants. Area of reactance and resonant frequency were significantly increased for participants with a history of bronchitis compared to healthy participants (0.68 (p=0.02) and 0.61 (p=0.04) standard deviation, respectively). These associations were independent of current smoking and asthma. Spirometry measures did not show any statistically significant relation to bronchitis (all p >0.05).