American Journal of Epidemiology Vol. 136, No. 10: 1258-1268
Copyright © 1992 by The Johns Hopkins University School of Hygiene and Public Health
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Maternal Age as a Risk Factor for Wheezing Lower Respiratory Illnesses in the First Year of Life
1The Respiratory Sciences Center, The University of Arizona Health Sciences Center Tuscon, AZ
2The Department of Pediatrics, The University of Arizona Health Sciences Center Tucson, Az
Reprint requests to Dr.Fernando D. martinez. Department of Pediatrics, University Medical Center, Tucson, Az 85724
Postneonatal mortality due to respiratory illesses is known to be inversely related to maternal age, but the possible role of young motherhood as a risk factor for respiratory morbidity in infants has not been throughly explored. The authors studies the Incidence of lower respiratory tract illnesses during thr first year of life, as ascertained by health plan pediatricians, in over 1, 200 infants enrolled at birth between 2980 and 1984 in Tucson, Arizona. The incidence of wheezing lower respiratory tract illnesses increases significantly (p=0.005) with decreasing maternal age, whereas the incidence of nonwhjeezing lower respiratoty tract illness was independent of maternal age. A logistic regression was used to contrlfor the effects of several known confounding factors. When compared with infants of mothers aged more than 30 years, adjusted odds ratios were 2.4 (95% confidence Interval 1.8–3.1) for infants whose mothers were less than age 21 years (p<0.0001), 1.8 (95% confidence interval 1.1–1.6) for infants whose mothers were aged 26–30 (p <0.0001). These results suggest that young motherhood is an important risk factor for wheezing lower respiratory tract illnesses during the first year of life. Both biological and social factors related to maternal age may explain these findings.Am J Epidemiol 1992; 136: 1258–68
bronchiolitis; maternal age; men; women
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