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Table 1 Subjects and workplaces characteristics

From: Exposure to high endotoxin concentration increases wheezing prevalence among laboratory animal workers: a cross-sectional study

Variables Total n = 751 Exposed group n = 412 Non-exposed group n = 339 p value
Workplaces 145 92 53  
Age (years) 29 (25–40) 29 (25–37) 30 (25–41) 0.14
Female, n (%) 446 (59.3 %) 221 (53.6 %) 225 (66.3 %) <0.001*
Dust (g/m2) 0.112 (0.04–0.31) 0.110 (0.02–0.23) 0.117 (0.05–0.31) 0.63
Endotoxin (EU/mg of dust) 20.4 (6.6–45.5) 34.2 (12.6–65.4) 10.2 (2.6–22.2) <0.001*
Technicians ̸administrators 326 (43.4 %) 140 (34.0 %) 186 (54.9 %) <0.001*
Students 360 (48.0 %) 240 (58.2 %) 120 (35.4 %)
Researchers 65 (8.6 %) 32 (7.8 %) 33 (9.7 %)
  1. Results are expressed as median (interquartile range) or n (%)
  2. *chi-square test
  3. EU endotoxin unit