A Longitudinal, Population-Based, Cohort Study of Childhood Asthma Followed to Adulthood
Malcolm R. Sears, M.B., Justina M. Greene, Andrew R. Willan, Ph.D., Elizabeth M. Wiecek, M.D., D. Robin Taylor, M.D., Erin M. Flannery, Jan O. Cowan, G. Peter Herbison, M.Sc., Phil A. Silva, Ph.D., and Richie Poulton, Ph.D.
Background The outcome of childhood asthma in adults has beendescribed in high-risk cohorts, but few population-based studieshave reported the risk factors for persistence and relapse.
Methods We assessed children born from April 1972 through March1973 in Dunedin, New Zealand, repeatedly from 9 to 26 yearsof age with questionnaires, pulmonary-function tests, bronchial-challengetesting, and allergy testing.
Results By the age of 26 years, 51.4 percent of 613 study memberswith complete respiratory data had reported wheezing at morethan one assessment. Eighty-nine study members (14.5 percent)had wheezing that persisted from childhood to 26 years of age,whereas 168 (27.4 percent) had remission, but 76 (12.4 percent)subsequently relapsed by the age of 26. Sensitization to housedust mites predicted the persistence of wheezing (odds ratio,2.41; P=0.001) and relapse (odds ratio, 2.18; P=0.01), as didairway hyperresponsiveness (odds ratio for persistence, 3.00;P<0.001; odds ratio for relapse, 3.03; P<0.001). Femalesex predicted the persistence of wheezing (odds ratio, 1.71;P=0.03), as did smoking at the age of 21 years (odds ratio,1.84; P=0.01). The earlier the age at onset, the greater therisk of relapse (odds ratio, 0.89 per year of increase in theage at onset; P<0.001). Pulmonary function was consistentlylower in those with persistent wheezing than in those withoutpersistent wheezing.
Conclusions In an unselected birth cohort, more than one infour children had wheezing that persisted from childhood toadulthood or that relapsed after remission. The factors predictingpersistence or relapse were sensitization to house dust mites,airway hyperresponsiveness, female sex, smoking, and early ageat onset. These findings, together with persistently low lungfunction, suggest that outcomes in adult asthma may be determinedprimarily in early childhood.
Source Information
From the Departments of Medicine (M.R.S., J.M.G.), and Clinical Epidemiology and Biostatistics (A.R.W., E.M.W.), McMaster University, Hamilton, Ont., Canada; and the Department of Medicine (D.R.T., E.M.F., J.O.C.), the Department of Preventive and Social Medicine (G.P.H.), and the Dunedin Multidisciplinary Health and Development Research Unit (P.A.S., R.P.), University of Otago, Dunedin, New Zealand.
Address reprint requests to Dr. Sears at the Firestone Institute for Respiratory Health, McMaster University and St. Joseph's Healthcare, 50 Charlton Ave. E., Hamilton, ON L8N 4A6, Canada, or at searsm{at}mcmaster.ca.
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