Kaplan, GG and Hubbard, J and Korzenik, J and Sands, BE and Panaccione, R and Ghosh, S and Wheeler, AJ and Villeneuve, PJ, The Inflammatory Bowel Diseases and Ambient Air Pollution: A Novel Association, American Journal of Gastroenterology pp. 1-8. ISSN 0002-9270 (2010) [Refereed Article]
Copyright 2010 The American College of Gastroenterology Licensed under the Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License http://creativecommons.org/licenses/by-nc-nd/3.0/
METHODS: The health improvement network (THIN) database in the United Kingdom was used to identify incident cases of Crohn's disease (n=367) or ulcerative colitis (n=591), and age- and sex-matched controls. Conditional logistic regression analyses assessed whether IBD patients were more likely to live in areas of higher ambient concentrations of nitrogen dioxide (NO(2)), sulfur dioxide (SO(2)), and particulate matter <10 μm (PM(10)), as determined by using quintiles of concentrations, after adjusting for smoking, socioeconomic status, non-steroidal anti-inflammatory drugs (NSAIDs), and appendectomy. Stratified analyses investigated effects by age.
RESULTS: Overall, NO(2), SO(2), and PM(10) were not associated with the risk of IBD. However, individuals ≤23 years were more likely to be diagnosed with Crohn's disease if they lived in regions with NO(2) concentrations within the upper three quintiles (odds ratio (OR)=2.31; 95% confidence interval (CI)=1.25-4.28), after adjusting for confounders. Among these Crohn's disease patients, the adjusted OR increased linearly across quintile levels for NO(2) (P=0.02). Crohn's disease patients aged 44-57 years were less likely to live in regions of higher NO(2) (OR=0.56; 95% CI=0.33-0.95) and PM(10) (OR=0.48; 95% CI=0.29-0.80). Ulcerative colitis patients ≤25 years (OR=2.00; 95% CI=1.08-3.72) were more likely to live in regions of higher SO(2); however, a dose-response effect was not observed.
CONCLUSIONS: On the whole, air pollution exposure was not associated with the incidence of IBD. However, residential exposures to SO(2) and NO(2) may increase the risk of early-onset ulcerative colitis and Crohn's disease, respectively. Future studies are needed to explore the age-specific effects of air pollution exposure on IBD risk.
|Item Type:||Refereed Article|
|Keywords:||air quality, health, appendicitis|
|Research Division:||Medical and Health Sciences|
|Research Group:||Public Health and Health Services|
|Research Field:||Environmental and Occupational Health and Safety|
|Objective Group:||Public Health (excl. Specific Population Health)|
|Objective Field:||Environmental Health|
|UTAS Author:||Wheeler, AJ (Dr Amanda Wheeler)|
|Web of Science® Times Cited:||98|
|Deposited By:||Menzies Institute for Medical Research|
|Downloads:||295 View Download Statistics|
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