Prevalence of respiratory symptoms in sheep breeders.
BACKGROUND
The European Farmers' Study has indicated that sheep farmers might be at risk for the development of respiratory symptoms.


OBJECTIVE
To assess the prevalence of respiratory symptoms in sheep breeders and potential work related risk factors.


METHODS
All sheep breeders listed in two regions of South Germany were asked to answer a mailed questionnaire on respiratory symptoms, work related respiratory symptoms (WRS), and details of farming. Overall, 325 sheep breeders keeping at least 10 sheep could be included in the survey (response rate 81.9%). The prevalences were compared to the results of the European Farmers' Study.


RESULTS
Sheep breeders showed a significantly higher prevalence of asthma related symptoms (prevalence odds ratio (POR) 2.1, 95% CI 1.5 to 3.0), chronic phlegm (POR 4.0, 95% CI 2.8 to 5.9), and WRS (POR 1.7, 95% CI 1.3 to 2.2) after adjusting for age, gender, smoking habits, full time farming, and study centre. In the multiple logistic regression model the risk for asthma related symptoms was doubled in full time farmers (POR 2.3, 95% CI 1.2 to 4.3). The major predictor of WRS was full time farming (POR 1.6, 95% CI 0.93 to 2.7) and the use of chemical footbaths (POR 2.1, 95% CI 1.2 to 3.7).


CONCLUSIONS
Sheep breeders might be at high risk for the development of respiratory symptoms. These symptoms may be associated with work intensity and chemical exposure during work. Studies including objective measurements should be performed.
D000293:Adolescent; D000368:Aged; D000382:Agricultural Workers' Diseases / Q000453:epidemiology* / Q000209:etiology; D000818:Animals; D001249:Asthma / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure / Q000009:adverse effects; D016017:Odds Ratio; D015995:Prevalence; D012140:Respiratory Tract Diseases / Q000453:epidemiology* / Q000209:etiology; D012307:Risk Factors; D012756:Sheep; D011795:Surveys and Questionnaires