Airway responsiveness in mild to moderate childhood asthma: sex influences on the natural history.

American Journal of Respiratory and Critical Care Medicine
Kelan G TantisiraChildhood Asthma Management Program Research Group

Abstract

Airway responsiveness is a prognostic marker for asthma symptoms in later life. To evaluate characteristics responsible for persistence of airway responsiveness in children with asthma. A total of 1,041 children, initially aged 5-12 years, with mild to moderate persistent asthma enrolled in the Childhood Asthma Management Program (CAMP) were studied prospectively for 8.6 +/- 1.8 years with methacholine challenges yearly. Least squares geometric mean models were fit to determine effects of sex and age on airway responsiveness (provocative concentration producing 20% decrease in FEV(1) [PC(20)]). Multiple linear regression analysis was performed to determine factors at baseline and over time, which were associated with PC(20) at end of follow-up. A total of 7,748 methacholine challenges were analyzed. PC(20) increased with age, with boys having greater increase after age 11 years than girls (P < 0.001). The divergence coincided with the mean age for Tanner stage 2. Postpubertal girls had greater airway responsiveness, even after adjustment for FEV(1) and other potential confounders. Although multivariable regression analyses noted a variety of factors that influenced airway responsivness in both sexes, a history of hay fever (bet...Continue Reading

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