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Table 3 Exposure-response between exhaled CO at the end of the working day and CO in ambient air

From: Exhaled carbon monoxide: a non-invasive biomarker of short-term exposure to outdoor air pollution

  2 last hours AmbCO 4 last hours AmbCO 6 last hours AmbCO
βa βb p βa βb p βa βb p
exhCO at the end of the shift 0.31 0.34 < 0.001 0.20 0.22 < 0.001 0.13 0.14 0.01
Exposure to tobacco smoke   0.12 0.17   0.17 0.27   0.11 0.54
Exposure to biomass   0.07 0.08   0.09 0.13   0.19 0.10
Any comorbidities   0.11 0.14   0.12 0.14   0.09 0.14
Abnormal lung function   0.01 0.25   0.03 0.20   0.05 0.18
Marital status   0.02 0.28   0.01 0.21   0.04 0.16
  1. ambCO ambient carbon monoxide, exhCO exhaled carbon monoxide
  2. acrude values
  3. badjusted values