reference : Effects of ambient pollen concentrations on frequency and severity of asthma symptoms among asthmatic children

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/reference/727c62e3-9a02-41cb-8c91-31ec4e1f1085
Bibliographic fields
reftype Journal Article
Abstract BACKGROUND: Previous studies on the associations between ambient pollen exposures and daily respiratory symptoms have produced inconsistent results. We investigated these relationships in a cohort of asthmatic children using pollen exposure models to estimate individual ambient exposures. METHODS: Daily symptoms of wheeze, night symptoms, shortness of breath, chest tightness, persistent cough, and rescue medication use were recorded in a cohort of 430 children with asthma (age 4-12 years) in Connecticut, Massachusetts, and New York. Daily ambient exposures to tree, grass, weed, and total pollen were estimated using mixed-effects models. We stratified analyses by use of asthma maintenance medication and sensitization to grass or weed pollens. Separate logistic regression analyses using generalized estimating equations were performed for each symptom outcome and pollen type. We adjusted analyses for maximum daily temperature, maximum 8-hour average ozone, fine particles (PM2.5), season, and antibiotic use. RESULTS: Associations were observed among children sensitized to specific pollens; these associations varied by use of asthma maintenance medication. Exposures to even relatively low levels of weed pollen (6-9 grains/m(3)) were associated with increased shortness of breath, chest tightness, rescue medication use, wheeze, and persistent cough, compared with lower exposure among sensitized children on maintenance medication. Grass pollen exposures >/= 2 grains/m(3) were associated with wheeze, night symptoms, shortness of breath, and persistent cough compared with lower exposure among sensitized children who did not take maintenance medication. CONCLUSION: Even low-level pollen exposure was associated with daily asthmatic symptoms.
Author DellaValle, C. T.; Triche, E. W.; Leaderer, B. P.; Bell, M. L.
DOI 10.1097/EDE.0b013e31823b66b8
Date Jan
ISSN 1531-5487
Issue 1
Journal Epidemiology
Keywords Asthma/*epidemiology/etiology; Child; Child, Preschool; Connecticut/epidemiology; Environmental Exposure/adverse effects; Female; Humans; Logistic Models; Male; Massachusetts/epidemiology; New York/epidemiology; Pollen/*adverse effects; Prospective Studies; Seasons; Severity of Illness Index; Weather
Language eng
Notes 1531-5487 DellaValle, Curt T Triche, Elizabeth W Leaderer, Brian P Bell, Michelle L ES01247/ES/NIEHS NIH HHS/United States ES05410/ES/NIEHS NIH HHS/United States ES07456/ES/NIEHS NIH HHS/United States ES11013/ES/NIEHS NIH HHS/United States R01 ES005410/ES/NIEHS NIH HHS/United States R01 ES005410-09/ES/NIEHS NIH HHS/United States R01 ES011013/ES/NIEHS NIH HHS/United States R01 ES011013-05A1/ES/NIEHS NIH HHS/United States Journal Article Research Support, N.I.H., Extramural United States Epidemiology. 2012 Jan;23(1):55-63. doi: 10.1097/EDE.0b013e31823b66b8.
Pages 55-63
Title Effects of ambient pollen concentrations on frequency and severity of asthma symptoms among asthmatic children
Volume 23
Year 2012
Bibliographic identifiers
.reference_type 0
_record_number 18463
_uuid 727c62e3-9a02-41cb-8c91-31ec4e1f1085