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Table 4 Evaluation of risk factors for asthma confirmed

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

Variables Categories Asthma confirmed by BHR
   Crude model Adjusted model
   PR 95 % CI p value PR 95 % CI p value
Group Exposed vs Non-exposed 1.08 0.69 1.68 0.73 1.12 0.71 1.76 0.63
Endotoxin levels Low vs High 1.21 0.78 1.88 0.40 0.79 0.51 1.22 0.29
Institutions UNICAMP vs USP 1.40 0.89 2.18 0.14 1.25 0.81 1.93 0.31
Atopy Yes vs No 7.07 3.68 13.58 <0.01 6.60 3,42 12.71 <0.01
Smoking Yes vs No 0.89 0.48 1.64 0.70 1.00 0.54 1.86 0.99
Sex Male vs Female 1.39 0.87 2.21 0.17 1.48 0.93 2.37 0.10
Past exposure to laboratory animals Yes vs No 1.36 0.87 2.14 0.17 1.24 0.79 1.94 0.35
Pet owning history Yes vs No 1.17 0.73 1.87 0.52 1.05 0.66 1.66 0.83
Age Continuous 0.96 0.94 0.99 <0.01 0.98 0.95 1.01 0.16
Worker functions Technicians/secretaries vs researchers 1.44 0.52 3.95 0.48 1.35 0.49 3.72 0.56
Students vs researchers 1.74 0.65 4.71 0.27 1.09 0.41 3.72 0.56
  1. BHR bronchial hyperresponsiveness, PR prevalence ratio, CI confidence interval, UNICAMP State University of Campinas, USP University of São Paulo, Low endotoxin concentration: ≤ 20.4 EU/mg of dust, High endotoxin concentration: > 20.4 EU/mg of dust