Fig. 1From: Exposure to high endotoxin concentration increases wheezing prevalence among laboratory animal workers: a cross-sectional studyWheezing prevalence according to endotoxin concentration in both groups. *p < 0.01 for the comparison of wheezing prevalence among levels of endotoxin concentration in the animal exposed group. Wheezing was a positive answer to the question: Have you had wheezing or whistling in your chest any time in the last 12 months?Back to article page