Predictors of Onset of Wheezing in Grain Elevator Workers

Author:

Pahwa Punam1,Senthilselvan Ambikaipakan12,McDuffie Helen H1,Dosman James A1

Affiliation:

1. 1Centre for Agricultural Medicine, Department of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

2. Department of Community Health and Epidemiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Abstract

A longitudinal study of Canadian grain elevator workers over a 12-year period was conducted. Data on respiratory symptoms and pulmonary function tests were collected once every three years as part of the Grain Dust Medical Surveillance Program started by Labour Canada in 1978; each three-year interval was called a 'cycle'. Of workers who had two or more observations, 1848 subjects (67.2%) were free of respiratory symptoms (wheeze, dyspnea, cough or sputum) at the baseline (cycle II). Predictors of first episode of wheezing were examined in these symptoms-free grain workers. Baseline mean age ± SD of the grain workers was 34.0±11.4 years and mean duration of work in the industry was 9.9±8.7 years. Of the 1848 symptoms-free grain workers at cycle II, 203 (11.0%) subsequently reported wheezing during the study. Cox's proportional hazards model for analysis of survival data was used to determine significant predictors of first episode of wheezing. Significant predictors for first episode of wheezing were current smoking (relative risk [RR] 2.33; 95% CI 1.63 to 3.33; P<0.0001) and baseline forced expiratory volume in 1 s to forced vital capacity ratio [RR 0.02; 95% CI 0.003 to 0.20; P<0.0001). Baseline pulmonary function measurements and smoking habits appear to be important predictors of future development of asthma-like symptoms in grain elevator workers.

Publisher

Hindawi Limited

Subject

Pulmonary and Respiratory Medicine

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Excess Longitudinal Decline in Lung Function in Grain Farmers;Journal of Agromedicine;2010-03-31

2. Effects of Grain Dust on Lungs Prior to and Following Dust Remediation;Journal of Occupational & Environmental Medicine;2008-12

3. Tumor Necrosis Factor Alpha and Pulmonary Function in Saskatchewan Grain Handlers;Journal of Occupational and Environmental Medicine;2006-05

4. Respiratory Findings in Farmworkers;Journal of Occupational and Environmental Medicine;2001-10

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